Alertmanager logs "lookup alertmanager-main-0.alertmanager-operated on 172.30.0.10:53: no such host"

Issue

• Alertmanager StatefulSets in the OpenShift Monitoring stack log the following transient warnings:

  $ oc -n openshift-monitoring logs alertmanager-main-0 -c alertmanager
  [...]
  t.=2024-03-13T06:41:54.248Z caller=cluster.go:471 level=warn component=cluster msg=refresh result=failure addr=alertmanager-main-0.alertmanager-operated:9094 err="1 error occurred:\n\t* Failed to resolve alertmanager-main-0.alertmanager-operated:9094: lookup alertmanager-main-0.alertmanager-operated on 172.30.0.10:53: no such host\n\n"
  ts=2024-03-13T06:44:39.259Z caller=cluster.go:471 level=warn component=cluster msg=refresh result=failure addr=alertmanager-main-1.alertmanager-operated:9094 err="1 error occurred:\n\t* Failed to resolve alertmanager-main-1.alertmanager-operated:9094: lookup alertmanager-main-1.alertmanager-operated on 172.30.0.10:53: no such host\n\n"
  ts=2024-03-13T06:44:54.248Z caller=cluster.go:471 level=warn component=cluster msg=refresh result=failure addr=alertmanager-main-1.alertmanager-operated:9094 err="1 error occurred:\n\t* Failed to resolve alertmanager-main-1.alertmanager-operated:9094: lookup alertmanager-main-1.alertmanager-operated on 172.30.0.10:53: no such host\n\n"