Ceph: Prometheus "/targets" url shows Prometheus is down
Issue
Visiting the URL https://$PROMETHEUS_SERVER:9092/targets shows Prometheus is DOWN. But the Prometheus service (container) is, in fact, up and running
Environment
Red Hat Ceph Storage (RHCS) 4.0.x
Red Hat Ceph Storage (RHCS) 4.1.x
Red Hat Ceph Storage (RHCS) 4.2.0
Red Hat Ceph Storage (RHCS) 4.2.1
Red Hat Ceph Storage (RHCS) 4.2.2
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