feat(postgres): rename metrics from cnpg_pg_ to pg_

ref: #18

Author: jon-nfc

manifests/postgres/components/metrics/kustomization.yaml

@@ -16,6 +16,11 @@ patches:
       - op: add
         path: /spec/monitoring/podMonitorRelabelings
         value:
+          - sourceLabels: [__name__]
+            regex: cnpg_pg_(.+)
+            targetLabel: __name__
+            replacement: pg_${1}
+            action: replace
           - sourceLabels: ["__meta_kubernetes_pod_label_cnpg_io_cluster"]
             targetLabel: cluster
             action: replace