chore(image-automation): bump gitea.renner.uno/gitea_admin/authentik-gate-sync:2026-10-29-1349

Updates managed by image-automation-controller.

ansible/inventory/group_vars/ntp_cluster.yml

@@ -8,7 +8,7 @@
 # two plays over this group -- withdraw the static assignments fleet-wide, then
 # hand the address to keepalived -- and both need the same value. Duplicating a
 # service address across plays is exactly the sort of thing that drifts.
-ntp_vip6: "fd40::123/128"
+ntp_vip6: "fd02:40::123/128"
 
 # Link-local address carried as the FIRST virtual_ipaddress of the IPv6 VRRP
 # instance. RFC 5798 gives an IPv6 virtual router a link-local primary, and

ansible/inventory/pve_hosts.yml

@@ -55,7 +55,7 @@ heating_can
 # THIS IS NO LONGER HIGHLY AVAILABLE. The group was jupiter (MASTER, prio 100),
 # saturn (90), neptune (80) and edge-1 (BACKUP, 70); the first three are gone.
 # A single VRRP member takes the address regardless of its configured state, so
-# fd40::123 is still served — verified answering — but by one thin client with
+# the service address is still served, but by one thin client with
 # no failover behind it. install-ntp-ha.yml still carries the four-host
 # ntp_servers priority map, which now describes hosts that do not exist.
 #

ansible/plays/install-ntp-ha.yml

@@ -62,7 +62,7 @@
   # One node at a time. The keepalived role withdraws the statically assigned
   # IPv6 service address and restarts keepalived so the address is re-taken
   # under VRRP control; doing that across every NTP server at once would leave
-  # the whole fleet with nobody holding fd40::123 until the elections settle.
+  # the whole fleet with nobody holding the service address until the elections settle.
   # Serialised, the remaining members keep answering throughout.
   serial: 1
 

ansible/roles/chrony-ntp-server/defaults/main.yml

@@ -4,7 +4,7 @@
 # Networks allowed to use this server as NTP source.
 #
 # BOTH families are required. IPv6 is the primary address family here -- the
-# service address ntp.srv.renner.uno resolves to fd40::123 -- so an IPv4-only
+# service address ntp.srv.renner.uno resolves to fd02:40::123 -- so an IPv4-only
 # allow list refuses every client that uses the documented name.
 #
 # The hosts carried `allow fd00::/8` for a long time without it ever being in

ansible/roles/keepalived-ntp/tasks/main.yml

@@ -99,7 +99,7 @@
 # quietly proceed either. install-edge-host.yml is a separate play with no
 # ordering relationship to this one, so nothing guarantees it has been re-run
 # to drop the [Address] block. If it has not, edge-1 would end up holding
-# fd40::123 statically AND running a VRRP instance for the same address:
+# the service address statically AND running a VRRP instance for the same address:
 # keepalived would believe it had withdrawn the address while networkd kept it
 # assigned, and the host would go on answering NTP with a clock the health
 # check had already rejected.
@@ -107,9 +107,9 @@
 # That is the precise failure of 2026-08-04, on the host it happened to, so it
 # fails fast rather than being left to inspection.
 # Matched on the bare address, not the full address/prefixlen, and anchored
-# with \b so it cannot also hit a longer address sharing the prefix (fd40::1234).
+# with \b so it cannot also hit a longer address sharing the prefix (fd02:40::1234).
 #
-# Searching for the literal "fd40::123/128" would fail open: a hand-written
+# Searching for the literal "fd02:40::123/128" would fail open: a hand-written
 # [Address] using any other mask -- /64, say -- would not match, the assert
 # below would pass, and keepalived would be handed an address networkd is
 # still assigning. Since this check is detect-only, with no delete afterwards

ansible/roles/uptime-kuma/defaults/main.yml

@@ -5,14 +5,9 @@ uptime_kuma_base_url: "https://{{ uptime_kuma_host }}"
 uptime_kuma_dir: /opt/uptime-kuma
 uptime_kuma_traefik_network: netbird_netbird
 
-uptime_kuma_smtp_from: uptime@renner.uno
-# Alertmanager email receiver in kubernetes/apps/monitoring/helmrelease-prometheus.yaml.
-uptime_kuma_smtp_to: admin@renner.uno
-
 uptime_kuma_openbao_url: https://openbao.renner.uno
 uptime_kuma_openbao_mount: homelab
 uptime_kuma_openbao_path: infrastructure/uptime-kuma
-uptime_kuma_openbao_smtp_path: infrastructure/uptime-kuma/smtp
 uptime_kuma_openbao_metrics_path: infrastructure/uptime-kuma-metrics
 # Token with policy uptime-kuma-vps, looked up like the bao CLI does:
 # VAULT_TOKEN, else the token helper file written by `bao login -method=oidc`.

ansible/roles/uptime-kuma/files/kuma-setup.js

@@ -1,4 +1,4 @@
-// Bootstraps Uptime Kuma: admin user, general settings, SMTP notification,
+// Bootstraps Uptime Kuma: admin user, general settings,
 // and (when KUMA_METRICS_ROTATE=true) a fresh Prometheus API key written to KUMA_METRICS_KEY_FILE.
 // All input comes from environment variables; secrets are never printed.
 // Output lines: "admin user created" / "already set up", then "changed: <step>" or "ok: <step>".
@@ -20,17 +20,7 @@ const SETTINGS_DEFAULTS = {
     trustProxy: false,
 };
 
-const REQUIRED = [
-    "KUMA_SETUP_USERNAME",
-    "KUMA_SETUP_PASSWORD",
-    "KUMA_BASE_URL",
-    "KUMA_SMTP_HOST",
-    "KUMA_SMTP_PORT",
-    "KUMA_SMTP_USERNAME",
-    "KUMA_SMTP_PASSWORD",
-    "KUMA_SMTP_FROM",
-    "KUMA_SMTP_TO",
-];
+const REQUIRED = ["KUMA_SETUP_USERNAME", "KUMA_SETUP_PASSWORD", "KUMA_BASE_URL"];
 const missing = REQUIRED.filter((name) => !process.env[name]);
 const rotateMetricsKey = process.env.KUMA_METRICS_ROTATE === "true";
 if (rotateMetricsKey && !process.env.KUMA_METRICS_KEY_FILE) {
@@ -44,7 +34,7 @@ const env = process.env;
 
 const socket = io(KUMA_URL, { transports: ["websocket"], reconnection: false });
 const lists = {};
-const LIST_EVENTS = ["notificationList", "apiKeyList"];
+const LIST_EVENTS = ["apiKeyList"];
 for (const event of LIST_EVENTS) {
     socket.on(event, (data) => {
         lists[event] = data;
@@ -123,34 +113,6 @@ async function ensureSettings() {
     report("settings", true);
 }
 
-async function ensureNotification() {
-    const port = Number(env.KUMA_SMTP_PORT);
-    const desired = {
-        name: "email",
-        type: "smtp",
-        isDefault: true,
-        smtpHost: env.KUMA_SMTP_HOST,
-        smtpPort: port,
-        // 465 is implicit TLS; any other port uses STARTTLS.
-        smtpSecure: port === 465,
-        smtpIgnoreSTARTTLS: false,
-        smtpUsername: env.KUMA_SMTP_USERNAME,
-        smtpPassword: env.KUMA_SMTP_PASSWORD,
-        smtpFrom: env.KUMA_SMTP_FROM,
-        smtpTo: env.KUMA_SMTP_TO,
-    };
-    const existing = (lists.notificationList || []).filter((n) => n.name === desired.name).sort((a, b) => a.id - b.id)[0];
-    const current = existing ? JSON.parse(existing.config || "{}") : {};
-    const upToDate =
-        existing && existing.isDefault === true && Object.keys(desired).every((key) => current[key] === desired[key]);
-    if (upToDate) {
-        report("notification", false);
-        return;
-    }
-    await callOk("addNotification", { ...current, ...desired, applyExisting: true }, existing ? existing.id : null);
-    report("notification", true);
-}
-
 async function rotateMetricsApiKey() {
     if (!rotateMetricsKey) {
         report("metrics api key", false);
@@ -169,7 +131,6 @@ async function main() {
     await setupAdmin();
     await login();
     await ensureSettings();
-    await ensureNotification();
     await rotateMetricsApiKey();
 }
 

ansible/roles/uptime-kuma/tasks/main.yml

@@ -23,18 +23,6 @@
   register: _uptime_kuma_secret_read
   no_log: true
 
-- name: Read SMTP credentials from OpenBao
-  ansible.builtin.uri:
-    url: "{{ uptime_kuma_openbao_url }}/v1/{{ uptime_kuma_openbao_mount }}/data/{{ uptime_kuma_openbao_smtp_path }}"
-    headers:
-      X-Vault-Token: "{{ uptime_kuma_openbao_token }}"
-  delegate_to: localhost
-  become: false
-  run_once: true
-  check_mode: false
-  register: _uptime_kuma_smtp_read
-  no_log: true
-
 # 404 until the role has stored a key for the first time.
 - name: Read metrics API key from OpenBao
   ansible.builtin.uri:
@@ -52,7 +40,6 @@
 - name: Extract the OpenBao secrets
   ansible.builtin.set_fact:
     _uptime_kuma_secret: "{{ _uptime_kuma_secret_read.json.data.data }}"
-    _uptime_kuma_smtp: "{{ _uptime_kuma_smtp_read.json.data.data }}"
     _uptime_kuma_metrics_key: "{{ _uptime_kuma_metrics_read.json.data.data.api_key if _uptime_kuma_metrics_read.status == 200 else '' }}"
   no_log: true
 
@@ -140,18 +127,6 @@
       - -e
       - KUMA_BASE_URL
       - -e
-      - KUMA_SMTP_HOST
-      - -e
-      - KUMA_SMTP_PORT
-      - -e
-      - KUMA_SMTP_USERNAME
-      - -e
-      - KUMA_SMTP_PASSWORD
-      - -e
-      - KUMA_SMTP_FROM
-      - -e
-      - KUMA_SMTP_TO
-      - -e
       - KUMA_METRICS_ROTATE
       - -e
       - KUMA_METRICS_KEY_FILE
@@ -164,12 +139,6 @@
     KUMA_SETUP_USERNAME: "{{ _uptime_kuma_secret.username }}"
     KUMA_SETUP_PASSWORD: "{{ _uptime_kuma_secret.password }}"
     KUMA_BASE_URL: "{{ uptime_kuma_base_url }}"
-    KUMA_SMTP_HOST: "{{ _uptime_kuma_smtp.server }}"
-    KUMA_SMTP_PORT: "{{ _uptime_kuma_smtp.port }}"
-    KUMA_SMTP_USERNAME: "{{ _uptime_kuma_smtp.username }}"
-    KUMA_SMTP_PASSWORD: "{{ _uptime_kuma_smtp.token }}"
-    KUMA_SMTP_FROM: "{{ uptime_kuma_smtp_from }}"
-    KUMA_SMTP_TO: "{{ uptime_kuma_smtp_to }}"
     KUMA_METRICS_ROTATE: "{{ 'false' if (_uptime_kuma_metrics_check.status | default(0)) == 200 else 'true' }}"
     KUMA_METRICS_KEY_FILE: /app/data/.metrics-api-key
   register: _uptime_kuma_setup

ci/images/kuma-sync/api/v1alpha1/kumamonitor_types.go

@@ -108,6 +108,17 @@ type KumaMonitorSpec struct {
 	JSONQuery *JSONQuerySpec `json:"jsonQuery,omitempty"`
 	DNS       *DNSSpec       `json:"dns,omitempty"`
 	Port      *PortSpec      `json:"port,omitempty"`
+
+	// KumaNotifications attached to the monitor; none attaches no notification.
+	// +listType=map
+	// +listMapKey=name
+	NotificationRefs []NotificationRef `json:"notificationRefs,omitempty"`
+}
+
+// NotificationRef references a KumaNotification.
+type NotificationRef struct {
+	// +kubebuilder:validation:MinLength=1
+	Name string `json:"name"`
 }
 
 type KumaMonitorStatus struct {

ci/images/kuma-sync/api/v1alpha1/kumanotification_types.go

@@ -0,0 +1,66 @@
+package v1alpha1
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// SecretRef references a Secret in any namespace.
+type SecretRef struct {
+	// +kubebuilder:validation:MinLength=1
+	Namespace string `json:"namespace"`
+	// +kubebuilder:validation:MinLength=1
+	Name string `json:"name"`
+}
+
+// SMTPSpec configures an smtp notification. The server and its credentials
+// come from the Secret: keys host, port, username and password, all required.
+// Port 465 uses implicit TLS, any other port STARTTLS.
+type SMTPSpec struct {
+	// +kubebuilder:validation:MinLength=1
+	From string `json:"from"`
+	// +kubebuilder:validation:MinLength=1
+	To        string    `json:"to"`
+	SecretRef SecretRef `json:"secretRef"`
+}
+
+// +kubebuilder:validation:XValidation:rule="(self.type == 'smtp') == has(self.smtp)",message="smtp is required for type smtp and forbidden otherwise"
+type KumaNotificationSpec struct {
+	// +kubebuilder:validation:Enum=smtp
+	Type string    `json:"type"`
+	SMTP *SMTPSpec `json:"smtp,omitempty"`
+}
+
+type KumaNotificationStatus struct {
+	NotificationID     int64 `json:"notificationID,omitempty"`
+	ObservedGeneration int64 `json:"observedGeneration,omitempty"`
+	// +listType=map
+	// +listMapKey=type
+	Conditions []metav1.Condition `json:"conditions,omitempty"`
+}
+
+// KumaNotification is the Kuma notification named like the resource. It is
+// never a default notification and never applied to existing monitors;
+// KumaMonitors attach it through notificationRefs.
+// +kubebuilder:object:root=true
+// +kubebuilder:subresource:status
+// +kubebuilder:resource:path=kumanotifications,scope=Cluster
+// +kubebuilder:printcolumn:name="Type",type=string,JSONPath=`.spec.type`
+// +kubebuilder:printcolumn:name="Ready",type=string,JSONPath=`.status.conditions[?(@.type=="Ready")].status`
+type KumaNotification struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	Spec   KumaNotificationSpec   `json:"spec"`
+	Status KumaNotificationStatus `json:"status,omitempty"`
+}
+
+// +kubebuilder:object:root=true
+type KumaNotificationList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata,omitempty"`
+	Items           []KumaNotification `json:"items"`
+}
+
+func init() {
+	SchemeBuilder.Register(&KumaNotification{}, &KumaNotificationList{})
+}

ci/images/kuma-sync/api/v1alpha1/notification_validation_test.go

@@ -0,0 +1,78 @@
+//go:build envtest
+
+package v1alpha1
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func smtpNotification(name string) *KumaNotification {
+	return &KumaNotification{
+		ObjectMeta: metav1.ObjectMeta{Name: name},
+		Spec: KumaNotificationSpec{Type: "smtp", SMTP: &SMTPSpec{
+			From: "kuma@renner.uno", To: "ops@renner.uno",
+			SecretRef: SecretRef{Namespace: "kuma-sync", Name: "smtp"},
+		}},
+	}
+}
+
+func expectNotificationInvalid(t *testing.T, n *KumaNotification, wants ...string) {
+	t.Helper()
+	err := k8s.Create(context.Background(), n)
+	if err == nil || !errors.IsInvalid(err) {
+		t.Fatalf("expected invalid, got %v", err)
+	}
+	for _, w := range wants {
+		if !strings.Contains(err.Error(), w) {
+			t.Fatalf("error %q does not contain %q", err.Error(), w)
+		}
+	}
+}
+
+func TestValidNotification(t *testing.T) {
+	if err := k8s.Create(context.Background(), smtpNotification("valid-smtp")); err != nil {
+		t.Fatalf("expected accept, got %v", err)
+	}
+}
+
+func TestNotificationInvalidSpecs(t *testing.T) {
+	noSMTP := smtpNotification("no-smtp")
+	noSMTP.Spec.SMTP = nil
+	expectNotificationInvalid(t, noSMTP, "smtp is required for type smtp")
+
+	webhook := smtpNotification("webhook")
+	webhook.Spec.Type = "webhook"
+	expectNotificationInvalid(t, webhook, "spec.type")
+
+	noTo := smtpNotification("no-to")
+	noTo.Spec.SMTP.To = ""
+	expectNotificationInvalid(t, noTo, "spec.smtp.to")
+
+	noSecret := smtpNotification("no-secret")
+	noSecret.Spec.SMTP.SecretRef.Namespace = ""
+	expectNotificationInvalid(t, noSecret, "spec.smtp.secretRef.namespace")
+}
+
+func TestMonitorNotificationRefs(t *testing.T) {
+	m := monitor("with-refs", KumaMonitorSpec{
+		Type: "group", DisplayName: "g",
+		NotificationRefs: []NotificationRef{{Name: "mail"}, {Name: "ops"}},
+	})
+	if err := k8s.Create(context.Background(), m); err != nil {
+		t.Fatalf("expected accept, got %v", err)
+	}
+	dup := monitor("dup-refs", KumaMonitorSpec{
+		Type: "group", DisplayName: "g",
+		NotificationRefs: []NotificationRef{{Name: "mail"}, {Name: "mail"}},
+	})
+	expectInvalid(t, dup, "Duplicate value")
+	empty := monitor("empty-ref", KumaMonitorSpec{
+		Type: "group", DisplayName: "g", NotificationRefs: []NotificationRef{{Name: ""}},
+	})
+	expectInvalid(t, empty, "spec.notificationRefs[0].name")
+}

ci/images/kuma-sync/api/v1alpha1/zz_generated.deepcopy.go

@@ -203,6 +203,11 @@ func (in *KumaMonitorSpec) DeepCopyInto(out *KumaMonitorSpec) {
 		*out = new(PortSpec)
 		**out = **in
 	}
+	if in.NotificationRefs != nil {
+		in, out := &in.NotificationRefs, &out.NotificationRefs
+		*out = make([]NotificationRef, len(*in))
+		copy(*out, *in)
+	}
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new KumaMonitorSpec.
@@ -237,6 +242,107 @@ func (in *KumaMonitorStatus) DeepCopy() *KumaMonitorStatus {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *KumaNotification) DeepCopyInto(out *KumaNotification) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ObjectMeta.DeepCopyInto(&out.ObjectMeta)
+	in.Spec.DeepCopyInto(&out.Spec)
+	in.Status.DeepCopyInto(&out.Status)
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new KumaNotification.
+func (in *KumaNotification) DeepCopy() *KumaNotification {
+	if in == nil {
+		return nil
+	}
+	out := new(KumaNotification)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *KumaNotification) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *KumaNotificationList) DeepCopyInto(out *KumaNotificationList) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
+	if in.Items != nil {
+		in, out := &in.Items, &out.Items
+		*out = make([]KumaNotification, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new KumaNotificationList.
+func (in *KumaNotificationList) DeepCopy() *KumaNotificationList {
+	if in == nil {
+		return nil
+	}
+	out := new(KumaNotificationList)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *KumaNotificationList) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *KumaNotificationSpec) DeepCopyInto(out *KumaNotificationSpec) {
+	*out = *in
+	if in.SMTP != nil {
+		in, out := &in.SMTP, &out.SMTP
+		*out = new(SMTPSpec)
+		**out = **in
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new KumaNotificationSpec.
+func (in *KumaNotificationSpec) DeepCopy() *KumaNotificationSpec {
+	if in == nil {
+		return nil
+	}
+	out := new(KumaNotificationSpec)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *KumaNotificationStatus) DeepCopyInto(out *KumaNotificationStatus) {
+	*out = *in
+	if in.Conditions != nil {
+		in, out := &in.Conditions, &out.Conditions
+		*out = make([]v1.Condition, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new KumaNotificationStatus.
+func (in *KumaNotificationStatus) DeepCopy() *KumaNotificationStatus {
+	if in == nil {
+		return nil
+	}
+	out := new(KumaNotificationStatus)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *KumaStatusPage) DeepCopyInto(out *KumaStatusPage) {
 	*out = *in
@@ -365,6 +471,21 @@ func (in *LocalRef) DeepCopy() *LocalRef {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *NotificationRef) DeepCopyInto(out *NotificationRef) {
+	*out = *in
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NotificationRef.
+func (in *NotificationRef) DeepCopy() *NotificationRef {
+	if in == nil {
+		return nil
+	}
+	out := new(NotificationRef)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *PortSpec) DeepCopyInto(out *PortSpec) {
 	*out = *in
@@ -380,6 +501,37 @@ func (in *PortSpec) DeepCopy() *PortSpec {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *SMTPSpec) DeepCopyInto(out *SMTPSpec) {
+	*out = *in
+	out.SecretRef = in.SecretRef
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new SMTPSpec.
+func (in *SMTPSpec) DeepCopy() *SMTPSpec {
+	if in == nil {
+		return nil
+	}
+	out := new(SMTPSpec)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *SecretRef) DeepCopyInto(out *SecretRef) {
+	*out = *in
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new SecretRef.
+func (in *SecretRef) DeepCopy() *SecretRef {
+	if in == nil {
+		return nil
+	}
+	out := new(SecretRef)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *SectionStatus) DeepCopyInto(out *SectionStatus) {
 	*out = *in

ci/images/kuma-sync/config/crd/uptime.renner.uno_kumamonitors.yaml

@@ -182,6 +182,22 @@ spec:
                 format: int32
                 minimum: 0
                 type: integer
+              notificationRefs:
+                description: KumaNotifications attached to the monitor; none attaches
+                  no notification.
+                items:
+                  description: NotificationRef references a KumaNotification.
+                  properties:
+                    name:
+                      minLength: 1
+                      type: string
+                  required:
+                  - name
+                  type: object
+                type: array
+                x-kubernetes-list-map-keys:
+                - name
+                x-kubernetes-list-type: map
               parentRef:
                 description: LocalRef references a KumaMonitor in the same namespace.
                 properties:

ci/images/kuma-sync/config/crd/uptime.renner.uno_kumanotifications.yaml

@@ -0,0 +1,165 @@
+---
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    controller-gen.kubebuilder.io/version: v0.23.0
+  name: kumanotifications.uptime.renner.uno
+spec:
+  group: uptime.renner.uno
+  names:
+    kind: KumaNotification
+    listKind: KumaNotificationList
+    plural: kumanotifications
+    singular: kumanotification
+  scope: Cluster
+  versions:
+  - additionalPrinterColumns:
+    - jsonPath: .spec.type
+      name: Type
+      type: string
+    - jsonPath: .status.conditions[?(@.type=="Ready")].status
+      name: Ready
+      type: string
+    name: v1alpha1
+    schema:
+      openAPIV3Schema:
+        description: |-
+          KumaNotification is the Kuma notification named like the resource. It is
+          never a default notification and never applied to existing monitors;
+          KumaMonitors attach it through notificationRefs.
+        properties:
+          apiVersion:
+            description: |-
+              APIVersion defines the versioned schema of this representation of an object.
+              Servers should convert recognized schemas to the latest internal value, and
+              may reject unrecognized values.
+              More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
+            type: string
+          kind:
+            description: |-
+              Kind is a string value representing the REST resource this object represents.
+              Servers may infer this from the endpoint the client submits requests to.
+              Cannot be updated.
+              In CamelCase.
+              More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
+            type: string
+          metadata:
+            type: object
+          spec:
+            properties:
+              smtp:
+                description: |-
+                  SMTPSpec configures an smtp notification. The server and its credentials
+                  come from the Secret: keys host, port, username and password, all required.
+                  Port 465 uses implicit TLS, any other port STARTTLS.
+                properties:
+                  from:
+                    minLength: 1
+                    type: string
+                  secretRef:
+                    description: SecretRef references a Secret in any namespace.
+                    properties:
+                      name:
+                        minLength: 1
+                        type: string
+                      namespace:
+                        minLength: 1
+                        type: string
+                    required:
+                    - name
+                    - namespace
+                    type: object
+                  to:
+                    minLength: 1
+                    type: string
+                required:
+                - from
+                - secretRef
+                - to
+                type: object
+              type:
+                enum:
+                - smtp
+                type: string
+            required:
+            - type
+            type: object
+            x-kubernetes-validations:
+            - message: smtp is required for type smtp and forbidden otherwise
+              rule: (self.type == 'smtp') == has(self.smtp)
+          status:
+            properties:
+              conditions:
+                items:
+                  description: Condition contains details for one aspect of the current
+                    state of this API Resource.
+                  properties:
+                    lastTransitionTime:
+                      description: |-
+                        lastTransitionTime is the last time the condition transitioned from one status to another.
+                        This should be when the underlying condition changed.  If that is not known, then using the time when the API field changed is acceptable.
+                      format: date-time
+                      type: string
+                    message:
+                      description: |-
+                        message is a human readable message indicating details about the transition.
+                        This may be an empty string.
+                      maxLength: 32768
+                      type: string
+                    observedGeneration:
+                      description: |-
+                        observedGeneration represents the .metadata.generation that the condition was set based upon.
+                        For instance, if .metadata.generation is currently 12, but the .status.conditions[x].observedGeneration is 9, the condition is out of date
+                        with respect to the current state of the instance.
+                      format: int64
+                      minimum: 0
+                      type: integer
+                    reason:
+                      description: |-
+                        reason contains a programmatic identifier indicating the reason for the condition's last transition.
+                        Producers of specific condition types may define expected values and meanings for this field,
+                        and whether the values are considered a guaranteed API.
+                        The value should be a CamelCase string.
+                        This field may not be empty.
+                      maxLength: 1024
+                      minLength: 1
+                      pattern: ^[A-Za-z]([A-Za-z0-9_,:]*[A-Za-z0-9_])?$
+                      type: string
+                    status:
+                      description: status of the condition, one of True, False, Unknown.
+                      enum:
+                      - "True"
+                      - "False"
+                      - Unknown
+                      type: string
+                    type:
+                      description: type of condition in CamelCase or in foo.example.com/CamelCase.
+                      maxLength: 316
+                      pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])$
+                      type: string
+                  required:
+                  - lastTransitionTime
+                  - message
+                  - reason
+                  - status
+                  - type
+                  type: object
+                type: array
+                x-kubernetes-list-map-keys:
+                - type
+                x-kubernetes-list-type: map
+              notificationID:
+                format: int64
+                type: integer
+              observedGeneration:
+                format: int64
+                type: integer
+            type: object
+        required:
+        - spec
+        type: object
+    served: true
+    storage: true
+    subresources:
+      status: {}

ci/images/kuma-sync/config/rbac/role.yaml

@@ -21,6 +21,7 @@ rules:
   - uptime.renner.uno
   resources:
   - kumamonitors
+  - kumanotifications
   - kumastatuspages
   verbs:
   - get
@@ -32,6 +33,7 @@ rules:
   - uptime.renner.uno
   resources:
   - kumamonitors/finalizers
+  - kumanotifications/finalizers
   - kumastatuspages/finalizers
   verbs:
   - update
@@ -39,6 +41,7 @@ rules:
   - uptime.renner.uno
   resources:
   - kumamonitors/status
+  - kumanotifications/status
   - kumastatuspages/status
   verbs:
   - get

ci/images/kuma-sync/internal/app/manager.go

@@ -78,6 +78,11 @@ func NewManager(o Options) (manager.Manager, error) {
 	if err := (&controller.StatusPageReconciler{Client: mgr.GetClient(), Kuma: o.Kuma, Resync: o.Resync}).SetupWithManager(mgr); err != nil {
 		return nil, fmt.Errorf("set up status page reconciler: %w", err)
 	}
+	if err := (&controller.NotificationReconciler{
+		Client: mgr.GetClient(), APIReader: mgr.GetAPIReader(), Kuma: o.Kuma, Resync: o.Resync,
+	}).SetupWithManager(mgr); err != nil {
+		return nil, fmt.Errorf("set up notification reconciler: %w", err)
+	}
 	if err := mgr.Add(&controller.GC{
 		Client:      mgr.GetClient(),
 		Kuma:        o.Kuma,

ci/images/kuma-sync/internal/controller/e2e_integration_test.go

@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"io"
 	"path/filepath"
-	"slices"
 	"sync"
 	"testing"
 	"time"
@@ -21,6 +20,7 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/types"
+	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
 	"k8s.io/client-go/util/retry"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/envtest"
@@ -85,6 +85,9 @@ func newE2E(t *testing.T) (*e2e, *envtest.Environment) {
 	t.Cleanup(func() { _ = env.Stop() })
 
 	scheme := runtime.NewScheme()
+	if err := clientgoscheme.AddToScheme(scheme); err != nil {
+		t.Fatal(err)
+	}
 	if err := v1.AddToScheme(scheme); err != nil {
 		t.Fatal(err)
 	}
@@ -411,46 +414,6 @@ func (f *e2e) webhook(name string, isDefault bool) int64 {
 	return id
 }
 
-func TestE2EDefaultNotifications(t *testing.T) {
-	f, env := newE2E(t)
-	first := f.webhook("first", true)
-	f.webhook("opt-in", false)
-	f.start(env)
-	f.apply(group("g", ""), dns("probe", "g"))
-
-	carry := func(want ...int64) func() (bool, string) {
-		return func() (bool, string) {
-			m := byKey(f.owned())
-			for _, k := range []string{"default/g", "default/probe"} {
-				got, ok := m[k]
-				if !ok {
-					return false, k + " missing"
-				}
-				if !slices.Equal(got.NotificationIDs, want) {
-					return false, fmt.Sprintf("%s carries %v, want %v", k, got.NotificationIDs, want)
-				}
-			}
-			return true, ""
-		}
-	}
-	eventually(t, 30*time.Second, "monitors created with the default notification", carry(first))
-
-	second := f.webhook("second", true)
-	want := []int64{first, second}
-	slices.Sort(want)
-	eventually(t, 30*time.Second, "new default notification attached by a resync", carry(want...))
-
-	var live monitor.DNS
-	if err := f.raw.GetMonitorAs(t.Context(), byKey(f.owned())["default/probe"].ID, &live); err != nil {
-		t.Fatal(err)
-	}
-	live.NotificationIDs = nil
-	if err := f.raw.UpdateMonitor(t.Context(), &live); err != nil {
-		t.Fatal(err)
-	}
-	eventually(t, 30*time.Second, "notifications removed by hand restored by a resync", carry(want...))
-}
-
 // A monitor that lost its ownership tag in the UI must not get a twin when the
 // controller restarts: the resource reports NotOwned and nothing is created.
 func TestE2ETagRemovedNeverDuplicates(t *testing.T) {

ci/images/kuma-sync/internal/controller/kumamonitor_controller.go

@@ -17,8 +17,11 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/builder"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
+	"sigs.k8s.io/controller-runtime/pkg/event"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
 	"sigs.k8s.io/controller-runtime/pkg/log"
 	"sigs.k8s.io/controller-runtime/pkg/predicate"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
 
 	v1 "gitea.renner.uno/konairius/homelab/kuma-sync/api/v1alpha1"
 	"gitea.renner.uno/konairius/homelab/kuma-sync/internal/kumaclient"
@@ -27,15 +30,16 @@ import (
 const (
 	Finalizer = "uptime.renner.uno/kuma-sync"
 
-	ReasonSynced          = "Synced"
-	ReasonParentPending   = "ParentPending"
-	ReasonInvalidParent   = "InvalidParent"
-	ReasonOwnerTagMissing = "OwnerTagMissing"
-	ReasonOwnerConflict   = "OwnerConflict"
-	ReasonDuplicateOwner  = "DuplicateOwner"
-	ReasonKumaUnavailable = "KumaUnavailable"
-	ReasonPossibleOrphan  = "PossibleOrphan"
-	ReasonNotOwned        = "NotOwned"
+	ReasonSynced              = "Synced"
+	ReasonParentPending       = "ParentPending"
+	ReasonInvalidParent       = "InvalidParent"
+	ReasonOwnerTagMissing     = "OwnerTagMissing"
+	ReasonOwnerConflict       = "OwnerConflict"
+	ReasonDuplicateOwner      = "DuplicateOwner"
+	ReasonKumaUnavailable     = "KumaUnavailable"
+	ReasonPossibleOrphan      = "PossibleOrphan"
+	ReasonNotOwned            = "NotOwned"
+	ReasonNotificationPending = "NotificationPending"
 
 	parentRetry    = 10 * time.Second
 	resyncPeriod   = 5 * time.Minute
@@ -65,10 +69,13 @@ func (r *Reconciler) resync() time.Duration {
 
 // SetupWithManager ignores status-only updates, which keeps failure backoff
 // intact. Deletion still reconciles: setting deletionTimestamp bumps
-// metadata.generation.
+// metadata.generation. A KumaNotification whose ID changes enqueues the
+// monitors referencing it.
 func (r *Reconciler) SetupWithManager(mgr ctrl.Manager) error {
 	return ctrl.NewControllerManagedBy(mgr).
 		For(&v1.KumaMonitor{}, builder.WithPredicates(predicate.GenerationChangedPredicate{})).
+		Watches(&v1.KumaNotification{}, handler.EnqueueRequestsFromMapFunc(r.referencingMonitors),
+			builder.WithPredicates(predicate.Funcs{UpdateFunc: notificationIDChanged})).
 		Named("kumamonitor").
 		Complete(r)
 }
@@ -82,18 +89,19 @@ type failure struct {
 }
 
 const (
-	msgKumaUnavailable = "Kuma request failed"
-	msgListIncomplete  = "monitor list incomplete: owner conflict on another monitor"
-	msgOwnerTagMissing = "kuma-sync tag missing in Kuma"
-	msgOwnerConflict   = "monitor carries conflicting kuma-sync tag values"
-	msgPossibleOrphan  = "create outcome unknown, an untagged monitor may exist in Kuma"
-	msgDuplicateOwner  = "several monitors carry this owner key; syncing the lowest ID"
-	msgParentPending   = "parent has no monitor ID yet"
-	msgParentNotGroup  = "parent must be of type group"
-	msgParentCycle     = "parentRef forms a cycle"
-	msgParentTooDeep   = "parentRef chain is too deep"
-	msgSynced          = "monitor in sync"
-	msgNotOwned        = "previous monitor exists without our ownership tag; restore the tag or delete it in Kuma"
+	msgKumaUnavailable     = "Kuma request failed"
+	msgListIncomplete      = "monitor list incomplete: owner conflict on another monitor"
+	msgOwnerTagMissing     = "kuma-sync tag missing in Kuma"
+	msgOwnerConflict       = "monitor carries conflicting kuma-sync tag values"
+	msgPossibleOrphan      = "create outcome unknown, an untagged monitor may exist in Kuma"
+	msgDuplicateOwner      = "several monitors carry this owner key; syncing the lowest ID"
+	msgParentPending       = "parent has no monitor ID yet"
+	msgParentNotGroup      = "parent must be of type group"
+	msgParentCycle         = "parentRef forms a cycle"
+	msgParentTooDeep       = "parentRef chain is too deep"
+	msgNotificationPending = "a referenced notification has no notification ID yet"
+	msgSynced              = "monitor in sync"
+	msgNotOwned            = "previous monitor exists without our ownership tag; restore the tag or delete it in Kuma"
 )
 
 func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
@@ -125,15 +133,22 @@ func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Resu
 		desired.Parent = &p.id
 	}
 
+	notifications, pending, err := r.resolveNotifications(ctx, km)
+	if err != nil {
+		return ctrl.Result{}, err
+	}
+	if pending {
+		if err := r.setReady(ctx, km, metav1.ConditionFalse, ReasonNotificationPending, msgNotificationPending, nil); err != nil {
+			return ctrl.Result{}, err
+		}
+		return ctrl.Result{RequeueAfter: parentRetry}, nil
+	}
+	desired.NotificationIDs = notifications
+
 	res, fail := r.lookup(ctx, desired.OwnerKey)
 	if fail != nil {
 		return r.fail(ctx, km, fail)
 	}
-	notifications, err := r.Kuma.DefaultNotifications(ctx)
-	if err != nil {
-		return r.fail(ctx, km, &failure{ReasonKumaUnavailable, msgKumaUnavailable, err})
-	}
-	desired.NotificationIDs = notifications
 
 	var id int64
 	if res.mon == nil {
@@ -250,6 +265,57 @@ func (r *Reconciler) lookup(ctx context.Context, key string) (lookupResult, *fai
 	return res, &failure{ReasonKumaUnavailable, msgListIncomplete, err}
 }
 
+// resolveNotifications returns the Kuma IDs of the referenced
+// KumaNotifications. pending reports a reference that does not exist, has no
+// notification ID yet or is being deleted. No references yield nil, which
+// detaches every notification in Kuma.
+func (r *Reconciler) resolveNotifications(ctx context.Context, km *v1.KumaMonitor) (ids []int64, pending bool, err error) {
+	for _, ref := range km.Spec.NotificationRefs {
+		kn := &v1.KumaNotification{}
+		err := r.Client.Get(ctx, types.NamespacedName{Name: ref.Name}, kn)
+		if apierrors.IsNotFound(err) {
+			return nil, true, nil
+		}
+		if err != nil {
+			return nil, false, err
+		}
+		if kn.Status.NotificationID == 0 || !kn.DeletionTimestamp.IsZero() {
+			return nil, true, nil
+		}
+		ids = append(ids, kn.Status.NotificationID)
+	}
+	return ids, false, nil
+}
+
+// notificationIDChanged reports changes that alter what a referencing
+// monitor attaches.
+func notificationIDChanged(e event.UpdateEvent) bool {
+	o, ok1 := e.ObjectOld.(*v1.KumaNotification)
+	n, ok2 := e.ObjectNew.(*v1.KumaNotification)
+	if !ok1 || !ok2 {
+		return true
+	}
+	return o.Status.NotificationID != n.Status.NotificationID ||
+		o.DeletionTimestamp.IsZero() != n.DeletionTimestamp.IsZero()
+}
+
+// referencingMonitors enqueues the KumaMonitors of all namespaces that
+// reference the notification.
+func (r *Reconciler) referencingMonitors(ctx context.Context, o client.Object) []reconcile.Request {
+	var list v1.KumaMonitorList
+	if err := r.Client.List(ctx, &list); err != nil {
+		log.FromContext(ctx).Error(err, "list KumaMonitors to enqueue")
+		return nil
+	}
+	var reqs []reconcile.Request
+	for _, km := range list.Items {
+		if slices.ContainsFunc(km.Spec.NotificationRefs, func(ref v1.NotificationRef) bool { return ref.Name == o.GetName() }) {
+			reqs = append(reqs, reconcile.Request{NamespacedName: types.NamespacedName{Namespace: km.Namespace, Name: km.Name}})
+		}
+	}
+	return reqs
+}
+
 type parentOutcome struct {
 	id      int64
 	reason  string // empty: resolved

ci/images/kuma-sync/internal/controller/kumamonitor_controller_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"slices"
 	"testing"
 	"time"
 
@@ -311,79 +310,6 @@ func TestReconcileListErrorNoCreate(t *testing.T) {
 	}
 }
 
-func TestReconcileCreateGetsDefaultNotifications(t *testing.T) {
-	group := &v1.KumaMonitor{
-		ObjectMeta: metav1.ObjectMeta{Namespace: "default", Name: "grp"},
-		Spec:       v1.KumaMonitorSpec{Type: "group", DisplayName: "grp", Interval: 60, RetryInterval: 60},
-	}
-	e := newEnv(t, httpMonitor("a"), group)
-	e.kuma.SetDefaultNotifications(7, 3)
-	for _, name := range []string{"a", "grp"} {
-		if _, err := e.reconcile(t, name); err != nil {
-			t.Fatal(err)
-		}
-		got := e.kuma.Get(e.get(t, name).Status.MonitorID)
-		if got == nil || !slices.Equal(got.NotificationIDs, []int64{3, 7}) {
-			t.Errorf("%s: kuma monitor = %+v, want notifications [3 7]", name, got)
-		}
-	}
-}
-
-func TestReconcileRevertsNotificationDrift(t *testing.T) {
-	km := httpMonitor("a")
-	e := newEnv(t, km)
-	e.kuma.SetDefaultNotifications(1, 2)
-	drifted := Desired(km)
-	drifted.NotificationIDs = []int64{2, 9}
-	id, _ := e.kuma.Create(t.Context(), drifted)
-	if _, err := e.reconcile(t, "a"); err != nil {
-		t.Fatal(err)
-	}
-	if e.cnt.updates != 1 || e.cnt.creates != 0 {
-		t.Fatalf("updates=%d creates=%d", e.cnt.updates, e.cnt.creates)
-	}
-	if got := e.kuma.Get(id).NotificationIDs; !slices.Equal(got, []int64{1, 2}) {
-		t.Errorf("notifications = %v, want [1 2]", got)
-	}
-}
-
-func TestReconcileUnchangedNotificationsNoUpdate(t *testing.T) {
-	km := httpMonitor("a")
-	e := newEnv(t, km)
-	e.kuma.SetDefaultNotifications(4, 2)
-	existing := Desired(km)
-	existing.NotificationIDs = []int64{4, 2}
-	e.kuma.Create(t.Context(), existing)
-	for range 2 {
-		if _, err := e.reconcile(t, "a"); err != nil {
-			t.Fatal(err)
-		}
-	}
-	if e.cnt.updates != 0 || e.cnt.creates != 0 {
-		t.Fatalf("updates=%d creates=%d, want 0 and 0", e.cnt.updates, e.cnt.creates)
-	}
-}
-
-func TestReconcileNotificationListErrorNoWrite(t *testing.T) {
-	adopt := httpMonitor("b")
-	e := newEnv(t, httpMonitor("a"), adopt)
-	drifted := Desired(adopt)
-	drifted.Interval = 30
-	e.kuma.Create(t.Context(), drifted)
-	e.kuma.SetNotificationsErr(errors.New("boom"))
-	for _, name := range []string{"a", "b"} {
-		if _, err := e.reconcile(t, name); err == nil {
-			t.Fatalf("%s: expected error", name)
-		}
-		if c := ready(t, e.get(t, name)); c.Status != metav1.ConditionFalse || c.Reason != ReasonKumaUnavailable {
-			t.Errorf("%s: Ready = %+v", name, c)
-		}
-	}
-	if e.cnt.creates != 0 || e.cnt.updates != 0 {
-		t.Errorf("creates=%d updates=%d", e.cnt.creates, e.cnt.updates)
-	}
-}
-
 func TestReconcileOwnerTagMissing(t *testing.T) {
 	e := newEnv(t, httpMonitor("a"))
 	e.kuma.SetErrs(kumaclient.ErrOwnerTagMissing, nil, nil, nil)

ci/images/kuma-sync/internal/controller/notification_controller.go

@@ -0,0 +1,240 @@
+package controller
+
+import (
+	"context"
+	"errors"
+	"reflect"
+	"strconv"
+	"strings"
+	"time"
+
+	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/builder"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
+	"sigs.k8s.io/controller-runtime/pkg/log"
+	"sigs.k8s.io/controller-runtime/pkg/predicate"
+
+	v1 "gitea.renner.uno/konairius/homelab/kuma-sync/api/v1alpha1"
+	"gitea.renner.uno/konairius/homelab/kuma-sync/internal/kumaclient"
+)
+
+const (
+	ReasonSecretMissing = "SecretMissing"
+	ReasonInvalidSecret = "InvalidSecret"
+	ReasonInvalidSpec   = "InvalidSpec"
+
+	msgNotificationSynced    = "notification in sync"
+	msgDuplicateNotification = "several notifications carry this name; syncing the lowest ID"
+	msgSecretMissing         = "secret not found or not readable"
+	msgSecretKeyMissing      = "secret lacks host, port, username or password"
+	msgInvalidSecretPort     = "secret port is not a number from 1 to 65535"
+	msgInvalidType           = "notification type is not supported"
+
+	// smtpsPort is the port that uses implicit TLS; any other uses STARTTLS.
+	smtpsPort = 465
+)
+
+// smtpSecretKeys are the keys the SMTP Secret must hold, none empty.
+var smtpSecretKeys = []string{"host", "port", "username", "password"}
+
+// +kubebuilder:rbac:groups=uptime.renner.uno,resources=kumanotifications,verbs=get;list;watch;update;patch
+// +kubebuilder:rbac:groups=uptime.renner.uno,resources=kumanotifications/status,verbs=get;update;patch
+// +kubebuilder:rbac:groups=uptime.renner.uno,resources=kumanotifications/finalizers,verbs=update
+
+// NotificationReconciler syncs KumaNotification resources to Kuma. The Kuma
+// notification is owned by name: the lowest-ID notification with the
+// resource's name is adopted, whoever made it.
+type NotificationReconciler struct {
+	Client client.Client
+	// APIReader reads the SMTP Secret uncached, so no Secret watch is needed:
+	// only get on the referenced Secret.
+	APIReader client.Reader
+	Kuma      kumaclient.Notifications
+	// Resync is how often a resource is reconciled again, which reverts edits
+	// made in Kuma and picks up Secret changes. 0 means 5 minutes.
+	Resync time.Duration
+}
+
+func (r *NotificationReconciler) resync() time.Duration {
+	if r.Resync > 0 {
+		return r.Resync
+	}
+	return resyncPeriod
+}
+
+// SetupWithManager ignores status-only updates. Secrets are not watched.
+func (r *NotificationReconciler) SetupWithManager(mgr ctrl.Manager) error {
+	return ctrl.NewControllerManagedBy(mgr).
+		For(&v1.KumaNotification{}, builder.WithPredicates(predicate.GenerationChangedPredicate{})).
+		Named("kumanotification").
+		Complete(r)
+}
+
+// specProblem is a Ready=False outcome that waits for a resync.
+type specProblem struct {
+	reason  string
+	message string
+}
+
+func (r *NotificationReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
+	kn := &v1.KumaNotification{}
+	if err := r.Client.Get(ctx, req.NamespacedName, kn); err != nil {
+		return ctrl.Result{}, client.IgnoreNotFound(err)
+	}
+	if !kn.DeletionTimestamp.IsZero() {
+		return r.reconcileDelete(ctx, kn)
+	}
+	if controllerutil.AddFinalizer(kn, Finalizer) {
+		if err := r.Client.Update(ctx, kn); err != nil {
+			return ctrl.Result{}, err
+		}
+	}
+
+	desired, problem, err := r.desired(ctx, kn)
+	if err != nil {
+		return ctrl.Result{}, err
+	}
+	if problem != nil {
+		err := r.setReady(ctx, kn, metav1.ConditionFalse, problem.reason, problem.message, nil)
+		return ctrl.Result{RequeueAfter: r.resync()}, err
+	}
+
+	list, err := r.Kuma.ListNotifications(ctx, kn.Name)
+	if err != nil {
+		return r.fail(ctx, kn, &failure{ReasonKumaUnavailable, msgKumaUnavailable, err})
+	}
+	var id int64
+	if len(list) == 0 {
+		id, err = r.Kuma.CreateNotification(ctx, desired)
+		if err != nil {
+			return r.fail(ctx, kn, &failure{ReasonKumaUnavailable, msgKumaUnavailable, err})
+		}
+	} else {
+		id = list[0].ID
+		desired.ID = id
+		if !desired.SameContent(list[0]) {
+			log.FromContext(ctx).Info("notification differs from spec, updating", "notificationID", id)
+			if err := r.Kuma.UpdateNotification(ctx, desired); err != nil {
+				return r.fail(ctx, kn, &failure{ReasonKumaUnavailable, msgKumaUnavailable, err})
+			}
+		}
+	}
+
+	if len(list) > 1 {
+		ids := make([]int64, 0, len(list))
+		for _, n := range list {
+			ids = append(ids, n.ID)
+		}
+		log.FromContext(ctx).Error(nil, "several Kuma notifications carry the same name, syncing the lowest ID",
+			"name", kn.Name, "notificationIDs", ids)
+		err := r.setReady(ctx, kn, metav1.ConditionFalse, ReasonDuplicateOwner, msgDuplicateNotification, &id)
+		return ctrl.Result{RequeueAfter: r.resync()}, err
+	}
+	if err := r.setReady(ctx, kn, metav1.ConditionTrue, ReasonSynced, msgNotificationSynced, &id); err != nil {
+		return ctrl.Result{}, err
+	}
+	return ctrl.Result{RequeueAfter: r.resync()}, nil
+}
+
+// reconcileDelete removes every notification carrying the name, duplicates
+// included. Kuma detaches them from the monitors.
+func (r *NotificationReconciler) reconcileDelete(ctx context.Context, kn *v1.KumaNotification) (ctrl.Result, error) {
+	if !controllerutil.ContainsFinalizer(kn, Finalizer) {
+		return ctrl.Result{}, nil
+	}
+	list, err := r.Kuma.ListNotifications(ctx, kn.Name)
+	if err != nil {
+		return r.fail(ctx, kn, &failure{ReasonKumaUnavailable, msgKumaUnavailable, err})
+	}
+	for _, n := range list {
+		err := r.Kuma.DeleteNotification(ctx, n.ID)
+		if err != nil && !errors.Is(err, kumaclient.ErrNotificationNotFound) {
+			return r.fail(ctx, kn, &failure{ReasonKumaUnavailable, msgKumaUnavailable, err})
+		}
+	}
+	controllerutil.RemoveFinalizer(kn, Finalizer)
+	return ctrl.Result{}, r.Client.Update(ctx, kn)
+}
+
+// desired builds the notification from the spec and the SMTP Secret. A
+// missing or invalid Secret is a problem, not an error; the cause is never
+// logged, as it may carry Secret data.
+func (r *NotificationReconciler) desired(
+	ctx context.Context, kn *v1.KumaNotification,
+) (kumaclient.Notification, *specProblem, error) {
+	s := kn.Spec.SMTP
+	if kn.Spec.Type != "smtp" || s == nil {
+		return kumaclient.Notification{}, &specProblem{ReasonInvalidSpec, msgInvalidType}, nil
+	}
+	secret := &corev1.Secret{}
+	err := r.APIReader.Get(ctx, types.NamespacedName{Namespace: s.SecretRef.Namespace, Name: s.SecretRef.Name}, secret)
+	if apierrors.IsNotFound(err) || apierrors.IsForbidden(err) {
+		return kumaclient.Notification{}, &specProblem{ReasonSecretMissing, msgSecretMissing}, nil
+	}
+	if err != nil {
+		return kumaclient.Notification{}, nil, err
+	}
+	for _, k := range smtpSecretKeys {
+		if len(secret.Data[k]) == 0 {
+			return kumaclient.Notification{}, &specProblem{ReasonSecretMissing, msgSecretKeyMissing}, nil
+		}
+	}
+	port, err := strconv.Atoi(strings.TrimSpace(string(secret.Data["port"])))
+	if err != nil || port < 1 || port > 65535 {
+		return kumaclient.Notification{}, &specProblem{ReasonInvalidSecret, msgInvalidSecretPort}, nil
+	}
+	return kumaclient.Notification{
+		Name:   kn.Name,
+		Type:   "smtp",
+		Active: true,
+		SMTP: kumaclient.SMTP{
+			Host:     strings.TrimSpace(string(secret.Data["host"])),
+			Port:     int32(port),
+			Secure:   port == smtpsPort,
+			Username: string(secret.Data["username"]),
+			Password: string(secret.Data["password"]),
+			From:     s.From,
+			To:       s.To,
+		},
+	}, nil, nil
+}
+
+// fail records a Ready=False outcome and returns its cause so the request is
+// requeued with backoff.
+func (r *NotificationReconciler) fail(ctx context.Context, kn *v1.KumaNotification, f *failure) (ctrl.Result, error) {
+	log.FromContext(ctx).Info("reconcile failed", "reason", f.reason, "error", f.err.Error())
+	if serr := r.setReady(ctx, kn, metav1.ConditionFalse, f.reason, f.message, nil); serr != nil {
+		return ctrl.Result{}, errors.Join(f.err, serr)
+	}
+	return ctrl.Result{}, f.err
+}
+
+// setReady writes the Ready condition, and the notification ID when given,
+// through the status subresource. It writes nothing if the status is
+// unchanged.
+func (r *NotificationReconciler) setReady(
+	ctx context.Context, kn *v1.KumaNotification, status metav1.ConditionStatus, reason, msg string, id *int64,
+) error {
+	orig := kn.Status.DeepCopy()
+	if id != nil {
+		kn.Status.NotificationID = *id
+		kn.Status.ObservedGeneration = kn.Generation
+	}
+	meta.SetStatusCondition(&kn.Status.Conditions, metav1.Condition{
+		Type:               v1.ConditionReady,
+		Status:             status,
+		Reason:             reason,
+		Message:            msg,
+		ObservedGeneration: kn.Generation,
+	})
+	if reflect.DeepEqual(*orig, kn.Status) {
+		return nil
+	}
+	return r.Client.Status().Update(ctx, kn)
+}

ci/images/kuma-sync/internal/controller/notification_controller_test.go

@@ -0,0 +1,278 @@
+package controller
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
+	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/client/fake"
+
+	v1 "gitea.renner.uno/konairius/homelab/kuma-sync/api/v1alpha1"
+	"gitea.renner.uno/konairius/homelab/kuma-sync/internal/kumaclient"
+)
+
+// countingNotifs records notification writes on top of the Kuma fake.
+type countingNotifs struct {
+	kumaclient.Notifications
+	creates, updates, deletes int
+}
+
+func (c *countingNotifs) CreateNotification(ctx context.Context, n kumaclient.Notification) (int64, error) {
+	c.creates++
+	return c.Notifications.CreateNotification(ctx, n)
+}
+
+func (c *countingNotifs) UpdateNotification(ctx context.Context, n kumaclient.Notification) error {
+	c.updates++
+	return c.Notifications.UpdateNotification(ctx, n)
+}
+
+func (c *countingNotifs) DeleteNotification(ctx context.Context, id int64) error {
+	c.deletes++
+	return c.Notifications.DeleteNotification(ctx, id)
+}
+
+type notifEnv struct {
+	r    *NotificationReconciler
+	k8s  client.Client
+	kuma *kumaclient.Fake
+	cnt  *countingNotifs
+}
+
+func newNotifEnv(t *testing.T, objs ...client.Object) *notifEnv {
+	t.Helper()
+	s := runtime.NewScheme()
+	if err := clientgoscheme.AddToScheme(s); err != nil {
+		t.Fatal(err)
+	}
+	if err := v1.AddToScheme(s); err != nil {
+		t.Fatal(err)
+	}
+	k8s := fake.NewClientBuilder().WithScheme(s).WithObjects(objs...).
+		WithStatusSubresource(&v1.KumaNotification{}).Build()
+	kf := kumaclient.NewFake()
+	cnt := &countingNotifs{Notifications: kf}
+	return &notifEnv{
+		r:   &NotificationReconciler{Client: k8s, APIReader: k8s, Kuma: cnt},
+		k8s: k8s, kuma: kf, cnt: cnt,
+	}
+}
+
+func smtpNotification(name string) *v1.KumaNotification {
+	return &v1.KumaNotification{
+		ObjectMeta: metav1.ObjectMeta{Name: name},
+		Spec: v1.KumaNotificationSpec{Type: "smtp", SMTP: &v1.SMTPSpec{
+			From: "kuma@renner.uno", To: "ops@renner.uno",
+			SecretRef: v1.SecretRef{Namespace: "kuma-sync", Name: "smtp"},
+		}},
+	}
+}
+
+func smtpSecret(port string) *corev1.Secret {
+	return &corev1.Secret{
+		ObjectMeta: metav1.ObjectMeta{Namespace: "kuma-sync", Name: "smtp"},
+		Data: map[string][]byte{
+			"host": []byte("mail.example.com\n"), "port": []byte(port),
+			"username": []byte("kuma"), "password": []byte("s3cret"),
+		},
+	}
+}
+
+func wantSMTP(name string, port int32, secure bool) kumaclient.Notification {
+	return kumaclient.Notification{
+		Name: name, Type: "smtp", Active: true,
+		SMTP: kumaclient.SMTP{
+			Host: "mail.example.com", Port: port, Secure: secure,
+			Username: "kuma", Password: "s3cret", From: "kuma@renner.uno", To: "ops@renner.uno",
+		},
+	}
+}
+
+func (e *notifEnv) reconcile(t *testing.T, name string) (ctrl.Result, error) {
+	t.Helper()
+	return e.r.Reconcile(t.Context(), ctrl.Request{NamespacedName: types.NamespacedName{Name: name}})
+}
+
+func (e *notifEnv) get(t *testing.T, name string) *v1.KumaNotification {
+	t.Helper()
+	kn := &v1.KumaNotification{}
+	if err := e.k8s.Get(t.Context(), types.NamespacedName{Name: name}, kn); err != nil {
+		t.Fatal(err)
+	}
+	return kn
+}
+
+func notifReady(t *testing.T, kn *v1.KumaNotification) *metav1.Condition {
+	t.Helper()
+	for i := range kn.Status.Conditions {
+		if kn.Status.Conditions[i].Type == v1.ConditionReady {
+			return &kn.Status.Conditions[i]
+		}
+	}
+	t.Fatal("no Ready condition")
+	return nil
+}
+
+func TestNotificationCreates(t *testing.T) {
+	for port, secure := range map[string]bool{"587": false, "465": true, " 25\n": false} {
+		e := newNotifEnv(t, smtpNotification("mail"), smtpSecret(port))
+		res, err := e.reconcile(t, "mail")
+		if err != nil {
+			t.Fatal(err)
+		}
+		if res.RequeueAfter != 5*time.Minute {
+			t.Errorf("RequeueAfter = %v", res.RequeueAfter)
+		}
+		kn := e.get(t, "mail")
+		if kn.Status.NotificationID == 0 || kn.Status.ObservedGeneration != kn.Generation || len(kn.Finalizers) != 1 {
+			t.Fatalf("resource = %+v", kn)
+		}
+		if c := notifReady(t, kn); c.Status != metav1.ConditionTrue || c.Reason != ReasonSynced {
+			t.Errorf("Ready = %+v", c)
+		}
+		want := wantSMTP("mail", map[string]int32{"587": 587, "465": 465, " 25\n": 25}[port], secure)
+		want.ID = kn.Status.NotificationID
+		if got := e.kuma.Notification(kn.Status.NotificationID); got == nil || *got != want {
+			t.Errorf("port %q: kuma notification = %+v, want %+v", port, got, want)
+		}
+	}
+}
+
+func TestNotificationAdoptsLowestAndRevertsDrift(t *testing.T) {
+	e := newNotifEnv(t, smtpNotification("email"), smtpSecret("587"))
+	drifted := wantSMTP("email", 25, false)
+	drifted.IsDefault = true
+	drifted.SMTP.Password = "old"
+	first := e.kuma.PutNotification(drifted)
+	if _, err := e.reconcile(t, "email"); err != nil {
+		t.Fatal(err)
+	}
+	if e.cnt.creates != 0 || e.cnt.updates != 1 {
+		t.Fatalf("creates=%d updates=%d, want 0 and 1", e.cnt.creates, e.cnt.updates)
+	}
+	want := wantSMTP("email", 587, false)
+	want.ID = first
+	if got := e.kuma.Notification(first); *got != want {
+		t.Errorf("kuma notification = %+v, want %+v", *got, want)
+	}
+	if got := e.get(t, "email").Status.NotificationID; got != first {
+		t.Errorf("notificationID = %d, want %d", got, first)
+	}
+	if _, err := e.reconcile(t, "email"); err != nil {
+		t.Fatal(err)
+	}
+	if e.cnt.updates != 1 {
+		t.Errorf("updates = %d after a second reconcile, want 1", e.cnt.updates)
+	}
+}
+
+func TestNotificationDuplicateName(t *testing.T) {
+	e := newNotifEnv(t, smtpNotification("email"), smtpSecret("587"))
+	first := e.kuma.PutNotification(wantSMTP("email", 587, false))
+	second := e.kuma.PutNotification(wantSMTP("email", 25, false))
+	if _, err := e.reconcile(t, "email"); err != nil {
+		t.Fatal(err)
+	}
+	kn := e.get(t, "email")
+	if kn.Status.NotificationID != first {
+		t.Errorf("notificationID = %d, want lowest %d", kn.Status.NotificationID, first)
+	}
+	if c := notifReady(t, kn); c.Status != metav1.ConditionFalse || c.Reason != ReasonDuplicateOwner {
+		t.Errorf("Ready = %+v", c)
+	}
+	if e.cnt.updates != 0 || e.kuma.Notification(second).SMTP.Port != 25 {
+		t.Error("only the lowest ID may be synced")
+	}
+}
+
+func TestNotificationSecretProblems(t *testing.T) {
+	noKey := smtpSecret("587")
+	delete(noKey.Data, "password")
+	for name, tc := range map[string]struct {
+		secret  client.Object
+		reason  string
+		message string
+	}{
+		"missing secret": {nil, ReasonSecretMissing, "secret not found or not readable"},
+		"missing key":    {noKey, ReasonSecretMissing, "secret lacks host, port, username or password"},
+		"bad port":       {smtpSecret("smtp"), ReasonInvalidSecret, "secret port is not a number from 1 to 65535"},
+		"port too large": {smtpSecret("70000"), ReasonInvalidSecret, "secret port is not a number from 1 to 65535"},
+	} {
+		objs := []client.Object{smtpNotification("mail")}
+		if tc.secret != nil {
+			objs = append(objs, tc.secret)
+		}
+		e := newNotifEnv(t, objs...)
+		res, err := e.reconcile(t, "mail")
+		if err != nil {
+			t.Fatalf("%s: %v", name, err)
+		}
+		if res.RequeueAfter != 5*time.Minute {
+			t.Errorf("%s: RequeueAfter = %v", name, res.RequeueAfter)
+		}
+		if c := notifReady(t, e.get(t, "mail")); c.Status != metav1.ConditionFalse || c.Reason != tc.reason || c.Message != tc.message {
+			t.Errorf("%s: Ready = %+v", name, c)
+		}
+		if e.cnt.creates != 0 || e.cnt.updates != 0 {
+			t.Errorf("%s: creates=%d updates=%d", name, e.cnt.creates, e.cnt.updates)
+		}
+	}
+}
+
+func TestNotificationKumaErrorNoWrite(t *testing.T) {
+	e := newNotifEnv(t, smtpNotification("mail"), smtpSecret("587"))
+	e.kuma.SetNotifErr(errors.New("boom"))
+	if _, err := e.reconcile(t, "mail"); err == nil {
+		t.Fatal("expected error")
+	}
+	if c := notifReady(t, e.get(t, "mail")); c.Reason != ReasonKumaUnavailable || c.Message != msgKumaUnavailable {
+		t.Errorf("Ready = %+v", c)
+	}
+}
+
+func TestNotificationDeleteRemovesAll(t *testing.T) {
+	kn := smtpNotification("email")
+	now := metav1.Now()
+	kn.DeletionTimestamp = &now
+	kn.Finalizers = []string{Finalizer}
+	e := newNotifEnv(t, kn)
+	first := e.kuma.PutNotification(wantSMTP("email", 587, false))
+	second := e.kuma.PutNotification(wantSMTP("email", 25, false))
+	other := e.kuma.PutNotification(wantSMTP("other", 25, false))
+	if _, err := e.reconcile(t, "email"); err != nil {
+		t.Fatal(err)
+	}
+	if e.kuma.Notification(first) != nil || e.kuma.Notification(second) != nil {
+		t.Error("every notification with the name must be deleted")
+	}
+	if e.kuma.Notification(other) == nil {
+		t.Error("other notification deleted")
+	}
+	if err := e.k8s.Get(t.Context(), client.ObjectKeyFromObject(kn), &v1.KumaNotification{}); !apierrors.IsNotFound(err) {
+		t.Errorf("finalizer not removed: %v", err)
+	}
+}
+
+func TestNotificationDeleteKumaErrorKeepsFinalizer(t *testing.T) {
+	kn := smtpNotification("email")
+	now := metav1.Now()
+	kn.DeletionTimestamp = &now
+	kn.Finalizers = []string{Finalizer}
+	e := newNotifEnv(t, kn)
+	e.kuma.SetNotifErr(errors.New("boom"))
+	if _, err := e.reconcile(t, "email"); err == nil {
+		t.Fatal("expected error")
+	}
+	if got := e.get(t, "email").Finalizers; len(got) != 1 {
+		t.Errorf("finalizers = %v", got)
+	}
+}

ci/images/kuma-sync/internal/controller/notification_e2e_integration_test.go

@@ -0,0 +1,98 @@
+//go:build integration
+
+package controller_test
+
+import (
+	"fmt"
+	"slices"
+	"testing"
+	"time"
+
+	"github.com/breml/go-uptime-kuma-client/monitor"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+
+	v1 "gitea.renner.uno/konairius/homelab/kuma-sync/api/v1alpha1"
+	"gitea.renner.uno/konairius/homelab/kuma-sync/internal/kumaclient"
+)
+
+// A KumaNotification adopts the hand-made notification of its name, and only
+// monitors referencing it carry it; a default notification is never attached.
+func TestE2ENotificationRefs(t *testing.T) {
+	f, env := newE2E(t)
+	legacy := f.webhook("legacy", true)
+	adopted := f.webhook("mail", false)
+	f.start(env)
+
+	secret := &corev1.Secret{
+		ObjectMeta: metav1.ObjectMeta{Namespace: "default", Name: "smtp"},
+		Data: map[string][]byte{
+			"host": []byte("mail.example.com"), "port": []byte("587"),
+			"username": []byte("kuma"), "password": []byte("s3cret"),
+		},
+	}
+	kn := &v1.KumaNotification{
+		ObjectMeta: metav1.ObjectMeta{Name: "mail"},
+		Spec: v1.KumaNotificationSpec{Type: "smtp", SMTP: &v1.SMTPSpec{
+			From: "kuma@example.com", To: "ops@example.com",
+			SecretRef: v1.SecretRef{Namespace: "default", Name: "smtp"},
+		}},
+	}
+	if err := f.k8s.Create(t.Context(), secret); err != nil {
+		t.Fatal(err)
+	}
+	if err := f.k8s.Create(t.Context(), kn); err != nil {
+		t.Fatal(err)
+	}
+	g := group("g", "")
+	g.Spec.NotificationRefs = []v1.NotificationRef{{Name: "mail"}}
+	f.apply(g, dns("probe", "g"))
+
+	want := kumaclient.Notification{
+		ID: adopted, Name: "mail", Type: "smtp", Active: true,
+		SMTP: kumaclient.SMTP{
+			Host: "mail.example.com", Port: 587, Username: "kuma", Password: "s3cret",
+			From: "kuma@example.com", To: "ops@example.com",
+		},
+	}
+	eventually(t, 30*time.Second, "notification adopted and converted", func() (bool, string) {
+		got, err := f.census.ListNotifications(t.Context(), "mail")
+		if err != nil {
+			return false, err.Error()
+		}
+		cur := &v1.KumaNotification{}
+		if err := f.k8s.Get(t.Context(), types.NamespacedName{Name: "mail"}, cur); err != nil {
+			return false, err.Error()
+		}
+		if len(got) != 1 || got[0] != want || cur.Status.NotificationID != adopted {
+			return false, fmt.Sprintf("kuma %+v, status ID %d", got, cur.Status.NotificationID)
+		}
+		return true, ""
+	})
+
+	carry := func(key string, want ...int64) func() (bool, string) {
+		return func() (bool, string) {
+			got, ok := byKey(f.owned())[key]
+			if !ok {
+				return false, key + " missing"
+			}
+			if !slices.Equal(got.NotificationIDs, want) {
+				return false, fmt.Sprintf("%s carries %v, want %v", key, got.NotificationIDs, want)
+			}
+			return true, ""
+		}
+	}
+	eventually(t, 30*time.Second, "group carries the referenced notification", carry("default/g", adopted))
+	eventually(t, 30*time.Second, "child carries none", carry("default/probe"))
+
+	var live monitor.Group
+	if err := f.raw.GetMonitorAs(t.Context(), byKey(f.owned())["default/g"].ID, &live); err != nil {
+		t.Fatal(err)
+	}
+	live.NotificationIDs = []int64{legacy}
+	if err := f.raw.UpdateMonitor(t.Context(), &live); err != nil {
+		t.Fatal(err)
+	}
+	eventually(t, 30*time.Second, "notifications changed by hand restored by a resync", carry("default/g", adopted))
+}

ci/images/kuma-sync/internal/controller/notificationrefs_test.go

@@ -0,0 +1,160 @@
+package controller
+
+import (
+	"slices"
+	"testing"
+	"time"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/event"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+
+	v1 "gitea.renner.uno/konairius/homelab/kuma-sync/api/v1alpha1"
+)
+
+func kumaNotification(name string, id int64) *v1.KumaNotification {
+	return &v1.KumaNotification{
+		ObjectMeta: metav1.ObjectMeta{Name: name},
+		Spec:       v1.KumaNotificationSpec{Type: "smtp"},
+		Status:     v1.KumaNotificationStatus{NotificationID: id},
+	}
+}
+
+func withRefs(km *v1.KumaMonitor, names ...string) *v1.KumaMonitor {
+	for _, n := range names {
+		km.Spec.NotificationRefs = append(km.Spec.NotificationRefs, v1.NotificationRef{Name: n})
+	}
+	return km
+}
+
+func TestReconcileAttachesReferencedNotifications(t *testing.T) {
+	group := withRefs(&v1.KumaMonitor{
+		ObjectMeta: metav1.ObjectMeta{Namespace: "default", Name: "grp"},
+		Spec:       v1.KumaMonitorSpec{Type: "group", DisplayName: "grp", Interval: 60, RetryInterval: 60},
+	}, "mail", "ops")
+	e := newEnv(t, withRefs(httpMonitor("a"), "ops"), group, kumaNotification("mail", 7), kumaNotification("ops", 3))
+	for name, want := range map[string][]int64{"a": {3}, "grp": {3, 7}} {
+		if _, err := e.reconcile(t, name); err != nil {
+			t.Fatal(err)
+		}
+		got := e.kuma.Get(e.get(t, name).Status.MonitorID)
+		if got == nil || !slices.Equal(got.NotificationIDs, want) {
+			t.Errorf("%s: kuma monitor = %+v, want notifications %v", name, got, want)
+		}
+	}
+}
+
+func TestReconcileNotificationPending(t *testing.T) {
+	deleted := kumaNotification("going", 5)
+	now := metav1.Now()
+	deleted.DeletionTimestamp = &now
+	deleted.Finalizers = []string{Finalizer}
+	e := newEnv(t,
+		withRefs(httpMonitor("missing"), "nope"),
+		withRefs(httpMonitor("unsynced"), "new"), kumaNotification("new", 0),
+		withRefs(httpMonitor("deleting"), "going"), deleted,
+	)
+	for _, name := range []string{"missing", "unsynced", "deleting"} {
+		res, err := e.reconcile(t, name)
+		if err != nil {
+			t.Fatalf("%s: %v", name, err)
+		}
+		if res.RequeueAfter != 10*time.Second {
+			t.Errorf("%s: RequeueAfter = %v", name, res.RequeueAfter)
+		}
+		c := ready(t, e.get(t, name))
+		if c.Status != metav1.ConditionFalse || c.Reason != ReasonNotificationPending ||
+			c.Message != "a referenced notification has no notification ID yet" {
+			t.Errorf("%s: Ready = %+v", name, c)
+		}
+	}
+	if e.cnt.creates != 0 || e.cnt.updates != 0 {
+		t.Errorf("creates=%d updates=%d", e.cnt.creates, e.cnt.updates)
+	}
+}
+
+func TestReconcileNoRefsDetachesNotifications(t *testing.T) {
+	km := httpMonitor("a")
+	e := newEnv(t, km)
+	attached := Desired(km)
+	attached.NotificationIDs = []int64{2, 9}
+	id, _ := e.kuma.Create(t.Context(), attached)
+	if _, err := e.reconcile(t, "a"); err != nil {
+		t.Fatal(err)
+	}
+	if e.cnt.updates != 1 {
+		t.Fatalf("updates = %d", e.cnt.updates)
+	}
+	if got := e.kuma.Get(id).NotificationIDs; got != nil {
+		t.Errorf("notifications = %v, want none", got)
+	}
+}
+
+func TestReconcileRevertsNotificationDrift(t *testing.T) {
+	km := withRefs(httpMonitor("a"), "mail")
+	e := newEnv(t, km, kumaNotification("mail", 1))
+	drifted := Desired(km)
+	drifted.NotificationIDs = []int64{2, 9}
+	id, _ := e.kuma.Create(t.Context(), drifted)
+	if _, err := e.reconcile(t, "a"); err != nil {
+		t.Fatal(err)
+	}
+	if e.cnt.updates != 1 || e.cnt.creates != 0 {
+		t.Fatalf("updates=%d creates=%d", e.cnt.updates, e.cnt.creates)
+	}
+	if got := e.kuma.Get(id).NotificationIDs; !slices.Equal(got, []int64{1}) {
+		t.Errorf("notifications = %v, want [1]", got)
+	}
+}
+
+func TestReconcileUnchangedNotificationsNoUpdate(t *testing.T) {
+	km := withRefs(httpMonitor("a"), "mail", "ops")
+	e := newEnv(t, km, kumaNotification("mail", 4), kumaNotification("ops", 2))
+	existing := Desired(km)
+	existing.NotificationIDs = []int64{4, 2}
+	e.kuma.Create(t.Context(), existing)
+	for range 2 {
+		if _, err := e.reconcile(t, "a"); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if e.cnt.updates != 0 || e.cnt.creates != 0 {
+		t.Fatalf("updates=%d creates=%d, want 0 and 0", e.cnt.updates, e.cnt.creates)
+	}
+}
+
+func TestReferencingMonitors(t *testing.T) {
+	other := withRefs(httpMonitor("b"), "mail")
+	other.Namespace = "other"
+	e := newEnv(t, withRefs(httpMonitor("a"), "ops", "mail"), other, httpMonitor("none"), withRefs(httpMonitor("c"), "ops"))
+	got := e.r.referencingMonitors(t.Context(), kumaNotification("mail", 1))
+	want := []reconcile.Request{
+		{NamespacedName: types.NamespacedName{Namespace: "default", Name: "a"}},
+		{NamespacedName: types.NamespacedName{Namespace: "other", Name: "b"}},
+	}
+	if !slices.Equal(got, want) {
+		t.Errorf("requests = %v, want %v", got, want)
+	}
+}
+
+func TestNotificationIDChanged(t *testing.T) {
+	base := kumaNotification("mail", 1)
+	changed := base.DeepCopy()
+	changed.Status.NotificationID = 2
+	cond := base.DeepCopy()
+	cond.Status.Conditions = []metav1.Condition{{Type: v1.ConditionReady, Status: metav1.ConditionTrue}}
+	deleting := base.DeepCopy()
+	now := metav1.Now()
+	deleting.DeletionTimestamp = &now
+	for name, tc := range map[string]struct {
+		n    *v1.KumaNotification
+		want bool
+	}{
+		"id changed": {changed, true}, "condition only": {cond, false}, "deleting": {deleting, true},
+	} {
+		if got := notificationIDChanged(event.UpdateEvent{ObjectOld: base, ObjectNew: tc.n}); got != tc.want {
+			t.Errorf("%s: %v, want %v", name, got, tc.want)
+		}
+	}
+}

ci/images/kuma-sync/internal/kumaclient/breml.go

@@ -13,7 +13,6 @@ import (
 
 	kuma "github.com/breml/go-uptime-kuma-client"
 	"github.com/breml/go-uptime-kuma-client/monitor"
-	"github.com/breml/go-uptime-kuma-client/notification"
 	"github.com/breml/go-uptime-kuma-client/tag"
 )
 
@@ -47,6 +46,9 @@ type Breml struct {
 	opts     []kuma.Option
 	token    string
 	backoff0 time.Duration
+	// notifStale means a notification write may be missing from the
+	// session's cached list.
+	notifStale bool
 }
 
 var _ Client = (*Breml)(nil)
@@ -158,7 +160,7 @@ func (b *Breml) checkSession(ctx context.Context, err error) (rebuilt, dead bool
 	if ctx.Err() != nil {
 		return false, false
 	}
-	for _, app := range []error{ErrNotFound, ErrNotOwned, ErrOwnerTagMissing, ErrOwnerConflict, ErrStatusPageNotFound} {
+	for _, app := range []error{ErrNotFound, ErrNotOwned, ErrOwnerTagMissing, ErrOwnerConflict, ErrStatusPageNotFound, ErrNotificationNotFound} {
 		if errors.Is(err, app) {
 			return false, false
 		}
@@ -196,6 +198,8 @@ func (b *Breml) reconnect(ctx context.Context) error {
 		}
 		_ = b.c.Disconnect()
 		b.c = c
+		// A new session starts with a fresh notification list.
+		b.notifStale = false
 		if t := c.SessionToken(); t != "" {
 			b.token = t
 		}
@@ -405,29 +409,6 @@ func (b *Breml) Delete(ctx context.Context, id int64) error {
 	return err
 }
 
-// DefaultNotifications reads the notification list cached by the session.
-// Kuma has no command to request it: it pushes the list at login and to every
-// session of the user after each change.
-func (b *Breml) DefaultNotifications(ctx context.Context) ([]int64, error) {
-	if err := ctx.Err(); err != nil {
-		return nil, err
-	}
-	b.mu.Lock()
-	defer b.mu.Unlock()
-	return defaultIDs(b.c.GetNotifications(ctx)), nil
-}
-
-func defaultIDs(list []notification.Base) []int64 {
-	var ids []int64
-	for _, n := range list {
-		if n.IsDefault {
-			ids = append(ids, n.ID)
-		}
-	}
-	slices.Sort(ids)
-	return ids
-}
-
 // toDomain converts a monitor from the Kuma monitor list.
 func toDomain(base monitor.Base, ownerKey string) (Monitor, error) {
 	m := Monitor{

ci/images/kuma-sync/internal/kumaclient/breml_integration_test.go

@@ -391,51 +391,6 @@ func TestUpdatePreservesUnmanagedAndClearsManaged(t *testing.T) {
 	assertUnmanaged(t, fresh, id, "after type change")
 }
 
-func TestDefaultNotificationsAndWrite(t *testing.T) {
-	ctx := context.Background()
-	url := startKuma(t)
-	b := setupClient(t, url)
-	other := freshClient(t, url)
-
-	if ids, err := other.DefaultNotifications(ctx); err != nil || ids != nil {
-		t.Fatalf("no notifications: ids=%v err=%v", ids, err)
-	}
-	def := createWebhook(t, b, "default", true)
-	createWebhook(t, b, "opt-in", false)
-	// Kuma pushes the list to every session of the user, not only the writer.
-	deadline := time.Now().Add(10 * time.Second)
-	for {
-		ids, err := other.DefaultNotifications(ctx)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if reflect.DeepEqual(ids, []int64{def}) {
-			break
-		}
-		if time.Now().After(deadline) {
-			t.Fatalf("other session sees defaults %v, want [%d]", ids, def)
-		}
-		time.Sleep(100 * time.Millisecond)
-	}
-
-	m := Monitor{
-		Type: "group", Name: "grp", Active: true, Interval: 60, RetryInterval: 60,
-		NotificationIDs: []int64{def}, OwnerKey: "default/grp",
-	}
-	id, err := b.Create(ctx, m)
-	if err != nil {
-		t.Fatal(err)
-	}
-	got, err := freshClient(t, url).ListOwned(ctx)
-	if err != nil {
-		t.Fatal(err)
-	}
-	m.ID = id
-	if !reflect.DeepEqual(byID(got)[id], m.Normalized()) {
-		t.Errorf("read-back differs:\n got  %+v\n want %+v", byID(got)[id], m.Normalized())
-	}
-}
-
 func TestRestartAdoptsByTag(t *testing.T) {
 	ctx := context.Background()
 	url := startKuma(t)

ci/images/kuma-sync/internal/kumaclient/breml_notification.go

@@ -0,0 +1,202 @@
+package kumaclient
+
+import (
+	"cmp"
+	"context"
+	"errors"
+	"fmt"
+	"maps"
+	"slices"
+	"strconv"
+
+	kuma "github.com/breml/go-uptime-kuma-client"
+	"github.com/breml/go-uptime-kuma-client/notification"
+)
+
+const typeSMTP = "smtp"
+
+// ListNotifications reads the notification list cached by the session. Kuma
+// has no command to request it: it pushes the list at login and to every
+// session of the user after each change. After a write whose broadcast was
+// missed the cache is rebuilt first, so a created notification is never
+// reported absent.
+func (b *Breml) ListNotifications(ctx context.Context, name string) ([]Notification, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	if b.notifStale {
+		if err := b.c.Resync(ctx); err != nil && !b.recoverSession(ctx, err) {
+			return nil, fmt.Errorf("resync notifications: %w", err)
+		}
+		b.notifStale = false
+	}
+	var out []Notification
+	for _, base := range b.c.GetNotifications(ctx) {
+		if base.Name != name {
+			continue
+		}
+		n, err := toNotification(base)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, n)
+	}
+	slices.SortFunc(out, func(a, b Notification) int { return cmp.Compare(a.ID, b.ID) })
+	return out, nil
+}
+
+// CreateNotification is never retried: Kuma may have stored the notification
+// although the ack was lost; the next list finds it by name.
+func (b *Breml) CreateNotification(ctx context.Context, n Notification) (int64, error) {
+	if n.Type != typeSMTP {
+		return 0, fmt.Errorf("create notification: unsupported type %q", n.Type)
+	}
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	wire := &notification.SMTP{
+		Base: notification.Base{Name: n.Name, IsActive: n.Active, IsDefault: n.IsDefault},
+	}
+	writeSMTP(&wire.SMTPDetails, n.SMTP)
+	id, err := b.c.CreateNotification(ctx, wire)
+	if err != nil {
+		b.notifStale = true
+	}
+	if createdDespite(id, err) {
+		return id, nil
+	}
+	b.recoverSession(ctx, err)
+	return 0, err
+}
+
+func (b *Breml) UpdateNotification(ctx context.Context, n Notification) error {
+	if n.Type != typeSMTP {
+		return fmt.Errorf("update notification %d: unsupported type %q", n.ID, n.Type)
+	}
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	_, err := withRecovery(ctx, b, func() (struct{}, error) { return struct{}{}, b.updateNotification(ctx, n) })
+	return err
+}
+
+// updateNotification starts from the notification's current config, so keys
+// kuma-sync does not manage are written back unchanged, also across a type
+// change.
+func (b *Breml) updateNotification(ctx context.Context, n Notification) error {
+	cur, err := b.c.GetNotification(ctx, n.ID)
+	if errors.Is(err, kuma.ErrNotFound) {
+		return fmt.Errorf("update notification %d: %w", n.ID, ErrNotificationNotFound)
+	}
+	if err != nil {
+		return err
+	}
+	var g notification.Generic
+	if err := cur.As(&g); err != nil {
+		return fmt.Errorf("notification %d: %w", n.ID, err)
+	}
+	g.Name = n.Name
+	g.IsActive = n.Active
+	g.IsDefault = n.IsDefault
+	g.ApplyExisting = false
+	g.TypeName = typeSMTP
+	g.GenericDetails = maps.Clone(g.GenericDetails)
+	if g.GenericDetails == nil {
+		g.GenericDetails = notification.GenericDetails{}
+	}
+	var d notification.SMTPDetails
+	writeSMTP(&d, n.SMTP)
+	g.GenericDetails["smtpHost"] = d.Host
+	g.GenericDetails["smtpPort"] = d.Port
+	g.GenericDetails["smtpSecure"] = d.Secure
+	g.GenericDetails["smtpIgnoreSTARTTLS"] = d.IgnoreSTARTTLS
+	g.GenericDetails["smtpUsername"] = d.Username
+	g.GenericDetails["smtpPassword"] = d.Password
+	g.GenericDetails["smtpFrom"] = d.From
+	g.GenericDetails["smtpTo"] = d.To
+	err = b.c.UpdateNotification(ctx, g)
+	if errors.Is(err, kuma.ErrUpdateEventTimeout) {
+		// Applied; only the broadcast is missing.
+		b.notifStale = true
+		return nil
+	}
+	return err
+}
+
+func (b *Breml) DeleteNotification(ctx context.Context, id int64) error {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	_, err := withRecovery(ctx, b, func() (struct{}, error) {
+		if _, err := b.c.GetNotification(ctx, id); errors.Is(err, kuma.ErrNotFound) {
+			return struct{}{}, fmt.Errorf("delete notification %d: %w", id, ErrNotificationNotFound)
+		}
+		err := b.c.DeleteNotification(ctx, id)
+		if errors.Is(err, kuma.ErrUpdateEventTimeout) {
+			b.notifStale = true
+			return struct{}{}, nil
+		}
+		return struct{}{}, err
+	})
+	return err
+}
+
+func writeSMTP(d *notification.SMTPDetails, s SMTP) {
+	d.Host = s.Host
+	d.Port = int(s.Port)
+	d.Secure = s.Secure
+	d.IgnoreSTARTTLS = s.IgnoreSTARTTLS
+	d.Username = s.Username
+	d.Password = s.Password
+	d.From = s.From
+	d.To = s.To
+}
+
+// toNotification reads the config loosely: a notification made in the Kuma UI
+// may hold the port as a string.
+func toNotification(base notification.Base) (Notification, error) {
+	n := Notification{
+		ID: base.ID, Name: base.Name, Type: base.Type(), IsDefault: base.IsDefault, Active: base.IsActive,
+	}
+	if n.Type != typeSMTP {
+		return n, nil
+	}
+	var g notification.Generic
+	if err := base.As(&g); err != nil {
+		return Notification{}, fmt.Errorf("notification %d: %w", base.ID, err)
+	}
+	d := g.GenericDetails
+	n.SMTP = SMTP{
+		Host:           configString(d, "smtpHost"),
+		Port:           configPort(d, "smtpPort"),
+		Secure:         configBool(d, "smtpSecure"),
+		IgnoreSTARTTLS: configBool(d, "smtpIgnoreSTARTTLS"),
+		Username:       configString(d, "smtpUsername"),
+		Password:       configString(d, "smtpPassword"),
+		From:           configString(d, "smtpFrom"),
+		To:             configString(d, "smtpTo"),
+	}
+	return n, nil
+}
+
+func configString(d notification.GenericDetails, key string) string {
+	s, _ := d[key].(string)
+	return s
+}
+
+func configBool(d notification.GenericDetails, key string) bool {
+	v, _ := d[key].(bool)
+	return v
+}
+
+// configPort returns 0 for a missing or unreadable port, which never matches a
+// desired one.
+func configPort(d notification.GenericDetails, key string) int32 {
+	switch v := d[key].(type) {
+	case float64:
+		return int32(v)
+	case string:
+		p, _ := strconv.ParseInt(v, 10, 32)
+		return int32(p)
+	}
+	return 0
+}

ci/images/kuma-sync/internal/kumaclient/client.go

@@ -21,6 +21,8 @@ var (
 	ErrPossibleOrphan = errors.New("possible untagged orphan monitor left in Kuma")
 	// ErrStatusPageNotFound means no status page has the slug.
 	ErrStatusPageNotFound = errors.New("status page not found")
+	// ErrNotificationNotFound means no notification has the ID.
+	ErrNotificationNotFound = errors.New("notification not found")
 )
 
 // ConflictError reports a monitor carrying several different kuma-sync tag
@@ -196,9 +198,7 @@ type Client interface {
 	// Delete removes an owned monitor. It wraps ErrNotFound for an unknown ID
 	// and ErrNotOwned for a monitor without the kuma-sync tag.
 	Delete(ctx context.Context, id int64) error
-	// DefaultNotifications returns the IDs of all notifications marked
-	// "default enabled" in Kuma, sorted. An empty result is valid.
-	DefaultNotifications(ctx context.Context) ([]int64, error)
 
 	StatusPages
+	Notifications
 }

ci/images/kuma-sync/internal/kumaclient/fake.go

@@ -3,7 +3,6 @@ package kumaclient
 import (
 	"context"
 	"fmt"
-	"slices"
 	"sort"
 	"sync"
 )
@@ -21,10 +20,6 @@ type Fake struct {
 	UpdateErr error
 	DeleteErr error
 	ProbeErr  error
-	// NotificationsErr is returned by DefaultNotifications.
-	NotificationsErr error
-	// Defaults are the IDs DefaultNotifications returns.
-	Defaults []int64
 	// ListPartial makes ListOwned return the stored monitors together with
 	// ListErr, as the real client does for owner conflicts.
 	ListPartial bool
@@ -35,6 +30,11 @@ type Fake struct {
 	nextGroupID int64
 	// PageErr, when set, is returned by every status page method.
 	PageErr error
+
+	notifications map[int64]Notification
+	nextNotifID   int64
+	// NotifErr, when set, is returned by every notification method.
+	NotifErr error
 }
 
 // SetListPartial makes ListOwned return the stored monitors and err.
@@ -50,6 +50,7 @@ func NewFake() *Fake {
 	return &Fake{
 		monitors: map[int64]Monitor{}, nextID: 1,
 		pages: map[string]StatusPage{}, pageGroups: map[int64]string{}, nextPageID: 1, nextGroupID: 1,
+		notifications: map[int64]Notification{}, nextNotifID: 1,
 	}
 }
 
@@ -105,32 +106,6 @@ func (f *Fake) Probe(_ context.Context, id int64) (bool, string, error) {
 	return ok, m.OwnerKey, nil
 }
 
-// SetDefaultNotifications sets the IDs DefaultNotifications returns.
-func (f *Fake) SetDefaultNotifications(ids ...int64) {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	f.Defaults = slices.Clone(ids)
-}
-
-// SetNotificationsErr makes DefaultNotifications return err.
-func (f *Fake) SetNotificationsErr(err error) {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	f.NotificationsErr = err
-}
-
-// DefaultNotifications returns Defaults, sorted.
-func (f *Fake) DefaultNotifications(_ context.Context) ([]int64, error) {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	if f.NotificationsErr != nil {
-		return nil, f.NotificationsErr
-	}
-	ids := slices.Clone(f.Defaults)
-	slices.Sort(ids)
-	return ids, nil
-}
-
 func (f *Fake) allocID() int64 {
 	id := f.nextID
 	f.nextID++

ci/images/kuma-sync/internal/kumaclient/fake_notification.go

@@ -0,0 +1,107 @@
+package kumaclient
+
+import (
+	"cmp"
+	"context"
+	"fmt"
+	"slices"
+)
+
+// SetNotifErr makes every notification method return err.
+func (f *Fake) SetNotifErr(err error) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.NotifErr = err
+}
+
+// Notification returns a copy of the stored notification, or nil.
+func (f *Fake) Notification(id int64) *Notification {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	n, ok := f.notifications[id]
+	if !ok {
+		return nil
+	}
+	return &n
+}
+
+// PutNotification stores n as if made in the Kuma UI. A zero ID is assigned
+// the next free one.
+func (f *Fake) PutNotification(n Notification) int64 {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if n.ID == 0 {
+		n.ID = f.nextNotifID
+		f.nextNotifID++
+	} else if n.ID >= f.nextNotifID {
+		f.nextNotifID = n.ID + 1
+	}
+	f.notifications[n.ID] = n
+	return n.ID
+}
+
+func (f *Fake) ListNotifications(_ context.Context, name string) ([]Notification, error) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if f.NotifErr != nil {
+		return nil, f.NotifErr
+	}
+	var out []Notification
+	for _, n := range f.notifications {
+		if n.Name == name {
+			out = append(out, n)
+		}
+	}
+	slices.SortFunc(out, func(a, b Notification) int { return cmp.Compare(a.ID, b.ID) })
+	return out, nil
+}
+
+func (f *Fake) CreateNotification(_ context.Context, n Notification) (int64, error) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if f.NotifErr != nil {
+		return 0, f.NotifErr
+	}
+	if n.Type != "smtp" {
+		return 0, fmt.Errorf("create notification: unsupported type %q", n.Type)
+	}
+	n.ID = f.nextNotifID
+	f.nextNotifID++
+	f.notifications[n.ID] = n
+	return n.ID, nil
+}
+
+func (f *Fake) UpdateNotification(_ context.Context, n Notification) error {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if f.NotifErr != nil {
+		return f.NotifErr
+	}
+	if _, ok := f.notifications[n.ID]; !ok {
+		return fmt.Errorf("update notification %d: %w", n.ID, ErrNotificationNotFound)
+	}
+	f.notifications[n.ID] = n
+	return nil
+}
+
+// DeleteNotification also detaches the notification from every monitor, as
+// Kuma does.
+func (f *Fake) DeleteNotification(_ context.Context, id int64) error {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if f.NotifErr != nil {
+		return f.NotifErr
+	}
+	if _, ok := f.notifications[id]; !ok {
+		return fmt.Errorf("delete notification %d: %w", id, ErrNotificationNotFound)
+	}
+	delete(f.notifications, id)
+	for mid, m := range f.monitors {
+		if i := slices.Index(m.NotificationIDs, id); i >= 0 {
+			m = m.clone()
+			m.NotificationIDs = slices.Delete(m.NotificationIDs, i, i+1)
+			f.monitors[mid] = m.Normalized()
+		}
+	}
+	return nil
+}

ci/images/kuma-sync/internal/kumaclient/fake_test.go

@@ -118,21 +118,6 @@ func TestFakeInjectedErrors(t *testing.T) {
 	}
 }
 
-func TestFakeDefaultNotifications(t *testing.T) {
-	f := NewFake()
-	if ids, err := f.DefaultNotifications(context.Background()); err != nil || ids != nil {
-		t.Fatalf("empty: %v %v", ids, err)
-	}
-	f.SetDefaultNotifications(4, 1)
-	if ids, err := f.DefaultNotifications(context.Background()); err != nil || len(ids) != 2 || ids[0] != 1 || ids[1] != 4 {
-		t.Fatalf("set: %v %v", ids, err)
-	}
-	f.SetNotificationsErr(errors.New("boom"))
-	if _, err := f.DefaultNotifications(context.Background()); err == nil {
-		t.Error("expected injected error")
-	}
-}
-
 func TestFakeUpdateRejectsOtherOwnerKey(t *testing.T) {
 	f := NewFake()
 	id, _ := f.Create(context.Background(), Monitor{Name: "a", OwnerKey: "ns/a"})

ci/images/kuma-sync/internal/kumaclient/logic_test.go

@@ -7,7 +7,6 @@ import (
 	"testing"
 
 	kuma "github.com/breml/go-uptime-kuma-client"
-	"github.com/breml/go-uptime-kuma-client/notification"
 	"github.com/breml/go-uptime-kuma-client/tag"
 )
 
@@ -182,15 +181,3 @@ func TestNormalizedNotificationIDs(t *testing.T) {
 		t.Errorf("empty notifications must be nil: %v", e.NotificationIDs)
 	}
 }
-
-func TestDefaultIDs(t *testing.T) {
-	got := defaultIDs([]notification.Base{
-		{ID: 5, IsDefault: true}, {ID: 1}, {ID: 3, IsDefault: true},
-	})
-	if !reflect.DeepEqual(got, []int64{3, 5}) {
-		t.Errorf("defaultIDs = %v, want [3 5]", got)
-	}
-	if got := defaultIDs(nil); got != nil {
-		t.Errorf("defaultIDs(nil) = %v, want nil", got)
-	}
-}

ci/images/kuma-sync/internal/kumaclient/notification.go

@@ -0,0 +1,54 @@
+package kumaclient
+
+import (
+	"context"
+)
+
+// Notification is the domain view of a Kuma notification. Only smtp is
+// modelled; for another type Type is set and SMTP is zero. Config keys
+// kuma-sync does not manage are kept as they are in Kuma.
+type Notification struct {
+	// ID is read only.
+	ID        int64
+	Name      string
+	Type      string
+	IsDefault bool
+	Active    bool
+	SMTP      SMTP
+}
+
+// SMTP is the managed part of an smtp notification's config.
+type SMTP struct {
+	Host string
+	Port int32
+	// Secure is implicit TLS; false is STARTTLS.
+	Secure         bool
+	IgnoreSTARTTLS bool
+	Username       string
+	Password       string
+	From           string
+	To             string
+}
+
+// SameContent reports whether n and o hold the same managed content. IDs are
+// ignored.
+func (n Notification) SameContent(o Notification) bool {
+	n.ID, o.ID = 0, 0
+	return n == o
+}
+
+// Notifications manages Kuma notifications by name. Kuma does not enforce
+// unique names.
+type Notifications interface {
+	// ListNotifications returns the notifications named name, by ascending ID.
+	ListNotifications(ctx context.Context, name string) ([]Notification, error)
+	// CreateNotification creates the notification and returns its ID. It never
+	// applies the notification to existing monitors.
+	CreateNotification(ctx context.Context, n Notification) (int64, error)
+	// UpdateNotification overwrites the managed fields of notification n.ID.
+	// It wraps ErrNotificationNotFound for an unknown ID.
+	UpdateNotification(ctx context.Context, n Notification) error
+	// DeleteNotification removes the notification and detaches it from every
+	// monitor. It wraps ErrNotificationNotFound for an unknown ID.
+	DeleteNotification(ctx context.Context, id int64) error
+}

ci/images/kuma-sync/internal/kumaclient/notification_integration_test.go

@@ -0,0 +1,108 @@
+//go:build integration
+
+package kumaclient
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/breml/go-uptime-kuma-client/notification"
+)
+
+// eventuallyListed waits until c lists exactly want under name; Kuma pushes
+// the list to every session of the user, not only the writer.
+func eventuallyListed(t *testing.T, c *Breml, name string, want ...Notification) {
+	t.Helper()
+	deadline := time.Now().Add(10 * time.Second)
+	for {
+		got, err := c.ListNotifications(context.Background(), name)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(got) == len(want) {
+			same := true
+			for i := range got {
+				same = same && got[i] == want[i]
+			}
+			if same {
+				return
+			}
+		}
+		if time.Now().After(deadline) {
+			t.Fatalf("session lists %+v, want %+v", got, want)
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
+}
+
+func TestNotificationRoundTrip(t *testing.T) {
+	ctx := context.Background()
+	url := startKuma(t)
+	b := setupClient(t, url)
+	other := freshClient(t, url)
+
+	n := Notification{
+		Name: "email", Type: "smtp", Active: true,
+		SMTP: SMTP{Host: "mail", Port: 587, Username: "u", Password: "p", From: "f@x", To: "t@x"},
+	}
+	id, err := b.CreateNotification(ctx, n)
+	if err != nil {
+		t.Fatal(err)
+	}
+	n.ID = id
+	eventuallyListed(t, b, "email", n)
+	eventuallyListed(t, other, "email", n)
+
+	n.SMTP.Port, n.SMTP.Secure, n.SMTP.Password = 465, true, "q"
+	if err := b.UpdateNotification(ctx, n); err != nil {
+		t.Fatal(err)
+	}
+	eventuallyListed(t, freshClient(t, url), "email", n)
+
+	if err := b.DeleteNotification(ctx, id); err != nil {
+		t.Fatal(err)
+	}
+	if err := b.DeleteNotification(ctx, id); !errors.Is(err, ErrNotificationNotFound) {
+		t.Errorf("second delete: %v", err)
+	}
+	if err := b.UpdateNotification(ctx, n); !errors.Is(err, ErrNotificationNotFound) {
+		t.Errorf("update deleted: %v", err)
+	}
+	eventuallyListed(t, freshClient(t, url), "email")
+}
+
+// An adopted notification made in the UI keeps the config kuma-sync does not
+// manage, and loses its default flag.
+func TestNotificationUpdatePreservesUnmanaged(t *testing.T) {
+	ctx := context.Background()
+	url := startKuma(t)
+	b := setupClient(t, url)
+
+	id, err := b.c.CreateNotification(ctx, &notification.SMTP{
+		Base: notification.Base{Name: "email", IsActive: true, IsDefault: true},
+		SMTPDetails: notification.SMTPDetails{
+			Host: "old", Port: 25, From: "f@x", To: "t@x", CustomSubject: "keep me",
+		},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	n := Notification{
+		ID: id, Name: "email", Type: "smtp", Active: true,
+		SMTP: SMTP{Host: "mail", Port: 587, Username: "u", Password: "p", From: "f@x", To: "t@x"},
+	}
+	if err := b.UpdateNotification(ctx, n); err != nil {
+		t.Fatal(err)
+	}
+	fresh := freshClient(t, url)
+	eventuallyListed(t, fresh, "email", n)
+	var got notification.SMTP
+	if err := fresh.c.GetNotificationAs(ctx, id, &got); err != nil {
+		t.Fatal(err)
+	}
+	if got.CustomSubject != "keep me" || got.IsDefault {
+		t.Errorf("customSubject = %q, isDefault = %v, want kept and false", got.CustomSubject, got.IsDefault)
+	}
+}

ci/images/kuma-sync/internal/kumaclient/notification_test.go

@@ -0,0 +1,125 @@
+package kumaclient
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"slices"
+	"testing"
+
+	"github.com/breml/go-uptime-kuma-client/notification"
+)
+
+// listRow decodes a notification as Kuma sends it in notificationList.
+func listRow(t *testing.T, row string) notification.Base {
+	t.Helper()
+	var b notification.Base
+	if err := json.Unmarshal([]byte(row), &b); err != nil {
+		t.Fatal(err)
+	}
+	return b
+}
+
+func TestToNotificationSMTP(t *testing.T) {
+	b := listRow(t, `{"id":3,"name":"email","active":true,"isDefault":true,"userId":1,`+
+		`"config":"{\"type\":\"smtp\",\"smtpHost\":\"mail\",\"smtpPort\":\"587\",\"smtpSecure\":false,`+
+		`\"smtpUsername\":\"u\",\"smtpPassword\":\"p\",\"smtpFrom\":\"f@x\",\"smtpTo\":\"t@x\",\"customSubject\":\"s\"}"}`)
+	got, err := toNotification(b)
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := Notification{
+		ID: 3, Name: "email", Type: "smtp", IsDefault: true, Active: true,
+		SMTP: SMTP{Host: "mail", Port: 587, Username: "u", Password: "p", From: "f@x", To: "t@x"},
+	}
+	if got != want {
+		t.Errorf("got  %+v\nwant %+v", got, want)
+	}
+}
+
+func TestToNotificationOtherType(t *testing.T) {
+	b := listRow(t, `{"id":4,"name":"hook","active":true,"isDefault":false,"userId":1,`+
+		`"config":"{\"type\":\"webhook\",\"webhookURL\":\"http://x\"}"}`)
+	got, err := toNotification(b)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != (Notification{ID: 4, Name: "hook", Type: "webhook", Active: true}) {
+		t.Errorf("got %+v", got)
+	}
+}
+
+func TestNotificationSameContent(t *testing.T) {
+	a := Notification{ID: 1, Name: "n", Type: "smtp", Active: true, SMTP: SMTP{Host: "h", Port: 25}}
+	b := a
+	b.ID = 2
+	if !a.SameContent(b) {
+		t.Error("IDs must be ignored")
+	}
+	b.SMTP.Password = "x"
+	if a.SameContent(b) {
+		t.Error("password change not detected")
+	}
+}
+
+func TestFakeNotifications(t *testing.T) {
+	ctx := context.Background()
+	f := NewFake()
+	other := f.PutNotification(Notification{Name: "email", Type: "webhook"})
+	id, err := f.CreateNotification(ctx, Notification{Name: "email", Type: "smtp", Active: true})
+	if err != nil {
+		t.Fatal(err)
+	}
+	f.PutNotification(Notification{Name: "else", Type: "smtp"})
+	got, err := f.ListNotifications(ctx, "email")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(got) != 2 || got[0].ID != other || got[1].ID != id {
+		t.Fatalf("list = %+v, want IDs [%d %d]", got, other, id)
+	}
+	if _, err := f.CreateNotification(ctx, Notification{Name: "x", Type: "webhook"}); err == nil {
+		t.Error("only smtp may be created")
+	}
+
+	up := *f.Notification(id)
+	up.SMTP.Host = "h"
+	if err := f.UpdateNotification(ctx, up); err != nil {
+		t.Fatal(err)
+	}
+	if f.Notification(id).SMTP.Host != "h" {
+		t.Error("not updated")
+	}
+	if err := f.UpdateNotification(ctx, Notification{ID: 99, Type: "smtp"}); !errors.Is(err, ErrNotificationNotFound) {
+		t.Errorf("update unknown: %v", err)
+	}
+
+	mid, _ := f.Create(ctx, Monitor{Name: "m", OwnerKey: "ns/m", NotificationIDs: []int64{other, id}})
+	if err := f.DeleteNotification(ctx, id); err != nil {
+		t.Fatal(err)
+	}
+	if f.Notification(id) != nil {
+		t.Error("not deleted")
+	}
+	if got := f.Get(mid).NotificationIDs; !slices.Equal(got, []int64{other}) {
+		t.Errorf("monitor notifications = %v, want [%d]", got, other)
+	}
+	if err := f.DeleteNotification(ctx, id); !errors.Is(err, ErrNotificationNotFound) {
+		t.Errorf("delete twice: %v", err)
+	}
+
+	boom := errors.New("boom")
+	f.SetNotifErr(boom)
+	if _, err := f.ListNotifications(ctx, "email"); !errors.Is(err, boom) {
+		t.Errorf("list: %v", err)
+	}
+	if _, err := f.CreateNotification(ctx, Notification{Type: "smtp"}); !errors.Is(err, boom) {
+		t.Errorf("create: %v", err)
+	}
+	if err := f.UpdateNotification(ctx, up); !errors.Is(err, boom) {
+		t.Errorf("update: %v", err)
+	}
+	if err := f.DeleteNotification(ctx, other); !errors.Is(err, boom) {
+		t.Errorf("delete: %v", err)
+	}
+}

kubernetes/apps/authentik/gate-sync.yaml

@@ -105,7 +105,7 @@ spec:
           type: RuntimeDefault
       containers:
         - name: controller
-          image: gitea.renner.uno/gitea_admin/authentik-gate-sync:2026-10-28-0712 # {"$imagepolicy": "flux-system:authentik-gate-sync"}
+          image: gitea.renner.uno/gitea_admin/authentik-gate-sync:2026-10-29-1349 # {"$imagepolicy": "flux-system:authentik-gate-sync"}
           securityContext:
             allowPrivilegeEscalation: false
             readOnlyRootFilesystem: true

kubernetes/apps/hermes/gitea-webhook-sync.yaml

@@ -32,7 +32,7 @@ spec:
               type: RuntimeDefault
           containers:
             - name: sync
-              image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+              image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
               command:
                 - /opt/hermes/.venv/bin/python
                 - /opt/hermes-skills/gitea-issues/scripts/sync_webhook.py

kubernetes/apps/hermes/hermes.yaml

@@ -51,7 +51,7 @@ spec:
         # connects from the pod network. No env equivalent exists, so it is
         # set in config.yaml on every start (idempotent).
         - name: config
-          image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+          image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
           command:
             - /opt/hermes/.venv/bin/hermes
             - config
@@ -75,7 +75,7 @@ spec:
               mountPath: /opt/data
         # WebSocket keepalive ping interval in seconds (default 20).
         - name: config-ws-ping
-          image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+          image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
           command:
             - /opt/hermes/.venv/bin/hermes
             - config
@@ -99,7 +99,7 @@ spec:
               mountPath: /opt/data
         # Skills from git (ConfigMap hermes-skills) beside the PVC's skills/.
         - name: skills-config
-          image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+          image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
           command:
             - /opt/hermes/.venv/bin/hermes
             - config
@@ -130,7 +130,7 @@ spec:
         # - alert-monitor: hourly; the script wakes the agent only for
         #   untriaged alerts.
         - name: cron-jobs
-          image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+          image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
           # Non-fatal: a broken jobs.json or a changed cron CLI after an image
           # bump logs a warning instead of keeping Hermes from starting.
           command:
@@ -187,7 +187,7 @@ spec:
               readOnly: true
         # Home Assistant MCP server; token resolved from HA_TOKEN at connect, writes need approval.
         - name: config-mcp-homeassistant
-          image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+          image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
           command:
             - /opt/hermes/.venv/bin/hermes
             - config
@@ -214,7 +214,7 @@ spec:
         # skills, the Home Assistant MCP and the tea login are re-applied on
         # every start. default gets the kanban toolset to hand cards to them.
         - name: experts
-          image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+          image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
           # Non-fatal like cron-jobs: a broken expert logs a warning.
           command:
             - sh
@@ -305,7 +305,7 @@ spec:
         # Gitea issues -> kanban (skills/gitea-issues): route script, webhook route on default,
         # completion shell hook plus its allowlist entry on every profile.
         - name: gitea-issues
-          image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+          image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
           # Non-fatal like cron-jobs: a failure logs a warning.
           command:
             - sh
@@ -368,7 +368,7 @@ spec:
               readOnly: true
         # Multiplexed default reads platform credentials only from .env (rationale: commit message).
         - name: default-env
-          image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+          image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
           # Fatal on a writer failure: without these Matrix and the API server stay down.
           command:
             - /opt/hermes/.venv/bin/python
@@ -428,7 +428,7 @@ spec:
         # tea login hermes-bot, written from the mounted token into an
         # emptyDir at the agent's ~/.config/tea.
         - name: tea-login
-          image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+          image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
           command:
             - sh
             - -ec
@@ -457,7 +457,7 @@ spec:
               readOnly: true
       containers:
         - name: hermes
-          image: gitea.renner.uno/konairius/hermes:2026-10-28-0704 # {"$imagepolicy": "flux-system:hermes"}
+          image: gitea.renner.uno/konairius/hermes:2026-10-29-1342 # {"$imagepolicy": "flux-system:hermes"}
           args: ["gateway", "run"]
           env:
             - name: HERMES_DASHBOARD

kubernetes/apps/hermes/skills/homelab-gitea-pr/references/uptime-monitoring.md

@@ -12,6 +12,8 @@ monitor, and its history starts over.
   namespace.
 - External targets go in `kubernetes/apps/monitoring/kumamonitors.yaml`. That covers the NetBird
   proxies, the Cloudflare-served apex `renner.uno` and third-party sites.
+- A monitor alerts only through its `notificationRefs` to cluster-scoped `KumaNotification`
+  objects (`kubernetes/apps/kuma-sync/notification-*.yaml`). Without refs it sends nothing.
 - The CRD lives in `infrastructure/kuma-sync-crds`. Every consuming Flux Kustomization needs
   the KumaMonitor `healthCheckExprs` entry with `current: "true"` (see SKILL.md pitfalls).
 

kubernetes/apps/home-assistant-iot/shelly-manager-deployment.yaml

@@ -64,7 +64,7 @@ spec:
           type: RuntimeDefault
       containers:
         - name: shelly-manager
-          image: gitea.renner.uno/konairius/shelly-manager:2026-10-29-0807 # {"$imagepolicy": "flux-system:shelly-manager"}
+          image: gitea.renner.uno/konairius/shelly-manager:2026-10-29-0949 # {"$imagepolicy": "flux-system:shelly-manager"}
           imagePullPolicy: IfNotPresent
           ports:
             - name: http

kubernetes/apps/home-assistant/zigbee2mqtt-deployment.yaml

@@ -66,7 +66,7 @@ spec:
           # (machine.registries.mirrors, applied by bootstrap.sh), and containerd
           # keeps the repository path when it falls through — so the path has to
           # exist on both registries. Steady state still pulls from Gitea.
-          image: gitea.renner.uno/konairius/alpine-jq:2026-10-28-0711 # {"$imagepolicy": "flux-system:alpine-jq"}
+          image: gitea.renner.uno/konairius/alpine-jq:2026-10-29-1348 # {"$imagepolicy": "flux-system:alpine-jq"}
           command:
             - sh
             - -c

kubernetes/apps/kuma-sync/deployment.yaml

@@ -30,7 +30,7 @@ spec:
           type: RuntimeDefault
       containers:
         - name: controller
-          image: gitea.renner.uno/gitea_admin/kuma-sync:2026-10-28-0712 # {"$imagepolicy": "flux-system:kuma-sync"}
+          image: gitea.renner.uno/gitea_admin/kuma-sync:2026-10-29-1313 # {"$imagepolicy": "flux-system:kuma-sync"}
           env:
             - name: KUMA_URL
               value: https://kuma.renner.uno

kubernetes/apps/kuma-sync/externalsecret.yaml

@@ -21,3 +21,34 @@ spec:
       remoteRef:
         key: infrastructure/kuma-sync
         property: password
+---
+# SMTP submission for the KumaNotification "email"; OpenBao homelab/infrastructure/uptime-kuma/smtp.
+apiVersion: external-secrets.io/v1
+kind: ExternalSecret
+metadata:
+  name: kuma-sync-smtp
+  namespace: kuma-sync
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    kind: ClusterSecretStore
+    name: openbao
+  target:
+    name: kuma-sync-smtp
+  data:
+    - secretKey: host
+      remoteRef:
+        key: infrastructure/uptime-kuma/smtp
+        property: server
+    - secretKey: port
+      remoteRef:
+        key: infrastructure/uptime-kuma/smtp
+        property: port
+    - secretKey: username
+      remoteRef:
+        key: infrastructure/uptime-kuma/smtp
+        property: username
+    - secretKey: password
+      remoteRef:
+        key: infrastructure/uptime-kuma/smtp
+        property: token

kubernetes/apps/kuma-sync/kustomization.yaml

@@ -5,3 +5,4 @@ resources:
   - rbac.yaml
   - deployment.yaml
   - statuspage-renner.yaml
+  - notification-email.yaml

kubernetes/apps/kuma-sync/notification-email.yaml

@@ -0,0 +1,14 @@
+---
+# Referenced by KumaMonitor spec.notificationRefs; unreferenced, it sends nothing.
+apiVersion: uptime.renner.uno/v1alpha1
+kind: KumaNotification
+metadata:
+  name: email
+spec:
+  type: smtp
+  smtp:
+    from: uptime@renner.uno
+    to: admin@renner.uno
+    secretRef:
+      namespace: kuma-sync
+      name: kuma-sync-smtp

kubernetes/apps/kuma-sync/rbac.yaml

@@ -7,20 +7,20 @@ metadata:
   labels:
     app.kubernetes.io/name: kuma-sync
 ---
-# Cluster-wide: KumaMonitor and KumaStatusPage objects live in any namespace.
+# Cluster-wide: KumaMonitor and KumaStatusPage objects live in any namespace; KumaNotification is cluster-scoped.
 apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRole
 metadata:
   name: kuma-sync
 rules:
   - apiGroups: ["uptime.renner.uno"]
-    resources: ["kumamonitors", "kumastatuspages"]
+    resources: ["kumamonitors", "kumastatuspages", "kumanotifications"]
     verbs: ["get", "list", "watch", "update", "patch"]
   - apiGroups: ["uptime.renner.uno"]
-    resources: ["kumamonitors/status", "kumastatuspages/status"]
+    resources: ["kumamonitors/status", "kumastatuspages/status", "kumanotifications/status"]
     verbs: ["get", "update", "patch"]
   - apiGroups: ["uptime.renner.uno"]
-    resources: ["kumamonitors/finalizers", "kumastatuspages/finalizers"]
+    resources: ["kumamonitors/finalizers", "kumastatuspages/finalizers", "kumanotifications/finalizers"]
     verbs: ["update"]
   - apiGroups: [""]
     resources: ["events"]
@@ -41,3 +41,29 @@ subjects:
   - kind: ServiceAccount
     name: kuma-sync
     namespace: kuma-sync
+---
+# SMTP credentials of the KumaNotification "email", read uncached.
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: kuma-sync-smtp
+  namespace: kuma-sync
+rules:
+  - apiGroups: [""]
+    resources: ["secrets"]
+    resourceNames: ["kuma-sync-smtp"]
+    verbs: ["get"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: kuma-sync-smtp
+  namespace: kuma-sync
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: kuma-sync-smtp
+subjects:
+  - kind: ServiceAccount
+    name: kuma-sync
+    namespace: kuma-sync

kubernetes/apps/paperless/paperless.yaml

@@ -155,7 +155,7 @@ spec:
           # exist on both registries — hence konairius/, which matches the ghcr
           # namespace. Steady state still pulls from Gitea and never leaves the
           # network.
-          image: gitea.renner.uno/konairius/alpine-openssl:2026-10-28-0711 # {"$imagepolicy": "flux-system:alpine-openssl"}
+          image: gitea.renner.uno/konairius/alpine-openssl:2026-10-29-1348 # {"$imagepolicy": "flux-system:alpine-openssl"}
           command:
             - sh
             - -c

kubernetes/apps/trmnl/renderer.yaml

@@ -184,7 +184,7 @@ spec:
           # (machine.registries.mirrors, applied by bootstrap.sh), and containerd
           # keeps the repository path, so it has to exist on both registries.
           # Steady state still pulls from Gitea.
-          image: gitea.renner.uno/konairius/alpine-jq:2026-10-28-0711 # {"$imagepolicy": "flux-system:alpine-jq"}
+          image: gitea.renner.uno/konairius/alpine-jq:2026-10-29-1348 # {"$imagepolicy": "flux-system:alpine-jq"}
           command:
             - sh
             - -c

kubernetes/infrastructure/kuma-sync-crds/crd-kumamonitors.yaml

@@ -183,6 +183,22 @@ spec:
                 format: int32
                 minimum: 0
                 type: integer
+              notificationRefs:
+                description: KumaNotifications attached to the monitor; none attaches
+                  no notification.
+                items:
+                  description: NotificationRef references a KumaNotification.
+                  properties:
+                    name:
+                      minLength: 1
+                      type: string
+                  required:
+                  - name
+                  type: object
+                type: array
+                x-kubernetes-list-map-keys:
+                - name
+                x-kubernetes-list-type: map
               parentRef:
                 description: LocalRef references a KumaMonitor in the same namespace.
                 properties:

kubernetes/infrastructure/kuma-sync-crds/crd-kumanotifications.yaml

@@ -0,0 +1,166 @@
+---
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    kustomize.toolkit.fluxcd.io/prune: disabled
+    controller-gen.kubebuilder.io/version: v0.23.0
+  name: kumanotifications.uptime.renner.uno
+spec:
+  group: uptime.renner.uno
+  names:
+    kind: KumaNotification
+    listKind: KumaNotificationList
+    plural: kumanotifications
+    singular: kumanotification
+  scope: Cluster
+  versions:
+  - additionalPrinterColumns:
+    - jsonPath: .spec.type
+      name: Type
+      type: string
+    - jsonPath: .status.conditions[?(@.type=="Ready")].status
+      name: Ready
+      type: string
+    name: v1alpha1
+    schema:
+      openAPIV3Schema:
+        description: |-
+          KumaNotification is the Kuma notification named like the resource. It is
+          never a default notification and never applied to existing monitors;
+          KumaMonitors attach it through notificationRefs.
+        properties:
+          apiVersion:
+            description: |-
+              APIVersion defines the versioned schema of this representation of an object.
+              Servers should convert recognized schemas to the latest internal value, and
+              may reject unrecognized values.
+              More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
+            type: string
+          kind:
+            description: |-
+              Kind is a string value representing the REST resource this object represents.
+              Servers may infer this from the endpoint the client submits requests to.
+              Cannot be updated.
+              In CamelCase.
+              More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
+            type: string
+          metadata:
+            type: object
+          spec:
+            properties:
+              smtp:
+                description: |-
+                  SMTPSpec configures an smtp notification. The server and its credentials
+                  come from the Secret: keys host, port, username and password, all required.
+                  Port 465 uses implicit TLS, any other port STARTTLS.
+                properties:
+                  from:
+                    minLength: 1
+                    type: string
+                  secretRef:
+                    description: SecretRef references a Secret in any namespace.
+                    properties:
+                      name:
+                        minLength: 1
+                        type: string
+                      namespace:
+                        minLength: 1
+                        type: string
+                    required:
+                    - name
+                    - namespace
+                    type: object
+                  to:
+                    minLength: 1
+                    type: string
+                required:
+                - from
+                - secretRef
+                - to
+                type: object
+              type:
+                enum:
+                - smtp
+                type: string
+            required:
+            - type
+            type: object
+            x-kubernetes-validations:
+            - message: smtp is required for type smtp and forbidden otherwise
+              rule: (self.type == 'smtp') == has(self.smtp)
+          status:
+            properties:
+              conditions:
+                items:
+                  description: Condition contains details for one aspect of the current
+                    state of this API Resource.
+                  properties:
+                    lastTransitionTime:
+                      description: |-
+                        lastTransitionTime is the last time the condition transitioned from one status to another.
+                        This should be when the underlying condition changed.  If that is not known, then using the time when the API field changed is acceptable.
+                      format: date-time
+                      type: string
+                    message:
+                      description: |-
+                        message is a human readable message indicating details about the transition.
+                        This may be an empty string.
+                      maxLength: 32768
+                      type: string
+                    observedGeneration:
+                      description: |-
+                        observedGeneration represents the .metadata.generation that the condition was set based upon.
+                        For instance, if .metadata.generation is currently 12, but the .status.conditions[x].observedGeneration is 9, the condition is out of date
+                        with respect to the current state of the instance.
+                      format: int64
+                      minimum: 0
+                      type: integer
+                    reason:
+                      description: |-
+                        reason contains a programmatic identifier indicating the reason for the condition's last transition.
+                        Producers of specific condition types may define expected values and meanings for this field,
+                        and whether the values are considered a guaranteed API.
+                        The value should be a CamelCase string.
+                        This field may not be empty.
+                      maxLength: 1024
+                      minLength: 1
+                      pattern: ^[A-Za-z]([A-Za-z0-9_,:]*[A-Za-z0-9_])?$
+                      type: string
+                    status:
+                      description: status of the condition, one of True, False, Unknown.
+                      enum:
+                      - "True"
+                      - "False"
+                      - Unknown
+                      type: string
+                    type:
+                      description: type of condition in CamelCase or in foo.example.com/CamelCase.
+                      maxLength: 316
+                      pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])$
+                      type: string
+                  required:
+                  - lastTransitionTime
+                  - message
+                  - reason
+                  - status
+                  - type
+                  type: object
+                type: array
+                x-kubernetes-list-map-keys:
+                - type
+                x-kubernetes-list-type: map
+              notificationID:
+                format: int64
+                type: integer
+              observedGeneration:
+                format: int64
+                type: integer
+            type: object
+        required:
+        - spec
+        type: object
+    served: true
+    storage: true
+    subresources:
+      status: {}

kubernetes/infrastructure/kuma-sync-crds/kustomization.yaml

@@ -2,4 +2,5 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
   - crd-kumamonitors.yaml
+  - crd-kumanotifications.yaml
   - crd-kumastatuspages.yaml

kubernetes/infrastructure/multus/cni-plugins-installer.yaml

@@ -73,7 +73,7 @@ spec:
           # No imagePullSecret: the ghcr namespace is private and its credential
           # is in machine.registries too, because a Secret would have to come
           # from OpenBao, which needs Ceph, which needs these binaries.
-          image: gitea.renner.uno/konairius/cni-plugins:2026-10-28-0711 # {"$imagepolicy": "flux-system:cni-plugins"}
+          image: gitea.renner.uno/konairius/cni-plugins:2026-10-29-1348 # {"$imagepolicy": "flux-system:cni-plugins"}
           command:
             - sh
             - -c

kubernetes/infrastructure/network-policies/home-assistant-ns.yaml

@@ -401,6 +401,13 @@ spec:
         - ports:
             - port: "80"
               protocol: TCP
+    # v30iot global addresses: the delegated prefix is not fixed.
+    - toCIDR:
+        - ::/0
+      toPorts:
+        - ports:
+            - port: "80"
+              protocol: TCP
     - toCIDR:
         - 224.0.0.251/32
       toPorts:

kubernetes/infrastructure/openbao/policies/uptime-kuma-vps.hcl

@@ -1,5 +1,5 @@
 # OpenBao policy: uptime-kuma-vps
-# Read on the Uptime Kuma admin and SMTP credentials; read/write on the metrics API key.
+# Read on the Uptime Kuma admin credentials; read/write on the metrics API key.
 # Bound to auth/oidc role owner, so the owner's login runs the uptime-kuma play. NOT applied by Flux.
 #
 #   bao policy write uptime-kuma-vps kubernetes/infrastructure/openbao/policies/uptime-kuma-vps.hcl
@@ -8,10 +8,6 @@ path "homelab/data/infrastructure/uptime-kuma" {
   capabilities = ["read"]
 }
 
-path "homelab/data/infrastructure/uptime-kuma/smtp" {
-  capabilities = ["read"]
-}
-
 path "homelab/data/infrastructure/uptime-kuma-metrics" {
   capabilities = ["read", "create", "update"]
 }

kubernetes/infrastructure/openbao/rotation/home-assistant.yaml

@@ -71,7 +71,7 @@ spec:
               type: RuntimeDefault
           containers:
             - name: rotate
-              image: gitea.renner.uno/gitea_admin/secret-rotator:2026-10-28 # {"$imagepolicy": "flux-system:secret-rotator"}
+              image: gitea.renner.uno/gitea_admin/secret-rotator:2026-10-29 # {"$imagepolicy": "flux-system:secret-rotator"}
               args: ["ha-token"]
               securityContext:
                 allowPrivilegeEscalation: false
@@ -133,7 +133,7 @@ spec:
               type: RuntimeDefault
           containers:
             - name: rotate
-              image: gitea.renner.uno/gitea_admin/secret-rotator:2026-10-28 # {"$imagepolicy": "flux-system:secret-rotator"}
+              image: gitea.renner.uno/gitea_admin/secret-rotator:2026-10-29 # {"$imagepolicy": "flux-system:secret-rotator"}
               args: ["ha-token"]
               securityContext:
                 allowPrivilegeEscalation: false
@@ -195,7 +195,7 @@ spec:
               type: RuntimeDefault
           containers:
             - name: rotate
-              image: gitea.renner.uno/gitea_admin/secret-rotator:2026-10-28 # {"$imagepolicy": "flux-system:secret-rotator"}
+              image: gitea.renner.uno/gitea_admin/secret-rotator:2026-10-29 # {"$imagepolicy": "flux-system:secret-rotator"}
               args: ["ha-token"]
               securityContext:
                 allowPrivilegeEscalation: false

opentofu/dns_renner_uno.tf

@@ -25,6 +25,12 @@ locals {
     # Talos K8s control-plane VIP (etcd-elected, see kubernetes/talos/patches/k8s-{1,2,3}.yaml)
     "k8s" = { type = "A", value = "10.2.40.60" }
 
+    # NTP VIPs held by keepalived (ansible/roles/keepalived-ntp): IPv4
+    # keepalived_ntp_vip, IPv6 ntp_vip6 (group_vars/ntp_cluster.yml).
+    # IPv4-only clients (Shelly Gen1) need the A.
+    "ntp.srv"      = { type = "A", value = "10.2.40.4" }
+    "ntp.srv/AAAA" = { name = "ntp.srv", type = "AAAA", value = "fd02:40::123" }
+
     # AAAA Records
     # UniFi auto-creates only the A record for the UDM's own hostname
     # (udm -> 192.168.8.1). Pin the AAAA to the UDM's management ULA
@@ -43,7 +49,7 @@ locals {
 resource "unifi_dns_record" "renner_uno" {
   for_each = local.renner_uno_records
 
-  name        = each.key == "@" ? "renner.uno" : "${each.key}.renner.uno"
+  name        = each.key == "@" ? "renner.uno" : "${try(each.value.name, each.key)}.renner.uno"
   record_type = each.value.type
   value       = each.value.value
   enabled     = true