feat(monitoring): add support for additional labels in PodMonitor configuration

Author: Dashing-Nelson

charts/cluster/README.md

@@ -169,6 +169,7 @@ refer to  the [CloudNativePG Documentation](https://cloudnative-pg.io/documentat
 | cluster.monitoring.disableDefaultQueries | bool | `false` | Whether the default queries should be injected. Set it to true if you don't want to inject default queries into the cluster. |
 | cluster.monitoring.enabled | bool | `false` | Whether to enable monitoring |
 | cluster.monitoring.podMonitor.enabled | bool | `true` | Whether to enable the PodMonitor |
+| cluster.monitoring.podMonitor.labels | object | `{}` | Additional labels to set on the generated PodMonitor resource. Add labels your monitoring stack requires (for example `team-name`). |
 | cluster.monitoring.podMonitor.metricRelabelings | list | `[]` | The list of metric relabelings for the PodMonitor. Applied to samples before ingestion. |
 | cluster.monitoring.podMonitor.relabelings | list | `[]` | The list of relabelings for the PodMonitor. Applied to samples before scraping. |
 | cluster.monitoring.prometheusRule.enabled | bool | `true` | Whether to enable the PrometheusRule automated alerts |

charts/cluster/examples/pgbouncer.yaml

@@ -7,6 +7,8 @@ cluster:
     enabled: true
     podMonitor:
       enabled: true
+      # labels:
+      #   team-name: my-team
 
 backups:
   enabled: false

charts/cluster/test/monitoring/01-monitoring_cluster-assert.yaml

@@ -36,6 +36,9 @@ apiVersion: monitoring.coreos.com/v1
 kind: PodMonitor
 metadata:
   name: monitoring-cluster
+  labels:
+    team-name: test-team
+    environment: test
 spec:
   selector:
     matchLabels:

charts/cluster/test/monitoring/01-monitoring_cluster.yaml

@@ -21,6 +21,9 @@ cluster:
               usage: GAUGE
               description: "Cache hit ratio"
     podMonitor:
+      labels:
+        team-name: test-team
+        environment: test
       relabelings:
         - targetLabel: environment
           replacement: test