feat: migrate core monitoring ServiceMonitors to EndpointSlice

This change sets serviceDiscoveryRole: EndpointSlice on ServiceMonitors
for the core Prometheus and Alertmanager components

ServiceMonitors migrated:
- prometheus-k8s (self-monitoring + thanos-sidecar)
- prometheus-user-workload (self-monitoring + thanos-sidecar)
- alertmanager-main
- alertmanager-user-workload

This follows the gradual migration pattern established in PR #2742 and is
part of the MON-4216 Epic.

Signed-off-by: Daniel Mellado <[email protected]>
Signed-off-by: Daniel Mellado <[email protected]>

Author: danielmellado

CHANGELOG.md

@@ -7,7 +7,7 @@
   - `KubePdbNotEnoughHealthyPods`
   - `KubeNodePressure`
   - `KubeNodeEviction`
-- [#2677](https://github.com/openshift/cluster-monitoring-operator/pull/2677) Fix KSM deny-list typo that put `^kube_.+_annotations$^kube_customresource_.+_annotations_info$,` in the deny-list instead of seperate entries, like so, `^kube_.+_annotations$,^kube_customresource_.+_annotations_info$,`, due to the omission of a comma.
+- [#2677](https://github.com/openshift/cluster-monitoring-operator/pull/2677) Fix KSM deny-list typo that put `^kube_.+_annotations$^kube_customresource_.+_annotations_info$,` in the deny-list instead of separate entries, like so, `^kube_.+_annotations$,^kube_customresource_.+_annotations_info$,`, due to the omission of a comma.
 
 ## 4.18
 

assets/alertmanager-user-workload/service-monitor.yaml

@@ -26,3 +26,4 @@ spec:
       app.kubernetes.io/instance: user-workload
       app.kubernetes.io/name: alertmanager
       app.kubernetes.io/part-of: openshift-monitoring
+  serviceDiscoveryRole: EndpointSlice

assets/alertmanager/service-monitor.yaml

@@ -26,3 +26,4 @@ spec:
       app.kubernetes.io/instance: main
       app.kubernetes.io/name: alertmanager
       app.kubernetes.io/part-of: openshift-monitoring
+  serviceDiscoveryRole: EndpointSlice

assets/prometheus-k8s/service-monitor-thanos-sidecar.yaml

@@ -26,3 +26,4 @@ spec:
   selector:
     matchLabels:
       app.kubernetes.io/component: thanos-sidecar
+  serviceDiscoveryRole: EndpointSlice

assets/prometheus-k8s/service-monitor.yaml

@@ -26,3 +26,4 @@ spec:
       app.kubernetes.io/instance: k8s
       app.kubernetes.io/name: prometheus
       app.kubernetes.io/part-of: openshift-monitoring
+  serviceDiscoveryRole: EndpointSlice

assets/prometheus-user-workload/service-monitor-thanos-sidecar.yaml

@@ -26,3 +26,4 @@ spec:
   selector:
     matchLabels:
       app.kubernetes.io/component: thanos-sidecar
+  serviceDiscoveryRole: EndpointSlice

assets/prometheus-user-workload/service-monitor.yaml

@@ -26,3 +26,4 @@ spec:
       app.kubernetes.io/instance: user-workload
       app.kubernetes.io/name: prometheus
       app.kubernetes.io/part-of: openshift-monitoring
+  serviceDiscoveryRole: EndpointSlice

jsonnet/components/alertmanager-user-workload.libsonnet

@@ -68,6 +68,7 @@ function(params)
 
     serviceMonitor+: {
       spec+: {
+        serviceDiscoveryRole: 'EndpointSlice',
         endpoints: [
           {
             port: 'metrics',

jsonnet/components/alertmanager.libsonnet

@@ -218,6 +218,7 @@ function(params)
 
     serviceMonitor+: {
       spec+: {
+        serviceDiscoveryRole: 'EndpointSlice',
         endpoints: [
           {
             port: 'metrics',

jsonnet/components/prometheus-user-workload.libsonnet

@@ -214,6 +214,7 @@ function(params)
 
     serviceMonitor+: {
       spec+: {
+        serviceDiscoveryRole: 'EndpointSlice',
         endpoints: [
           {
             port: 'metrics',
@@ -241,6 +242,7 @@ function(params)
 
     serviceMonitorThanosSidecar+: {
       spec+: {
+        serviceDiscoveryRole: 'EndpointSlice',
         jobLabel:: null,
         endpoints: [
           {