Prometheus trigger reload error

Issue

• Prometheus pod is in CrashLoopBackOff
• The config-reloader container shows messages like below:

# oc logs -c config-reloader prometheus-k8s-0
. . .
level=error ts=2022-01-18T07:19:08.026886949Z caller=runutil.go:101 msg="function failed. Retrying in next tick" err="trigger reload: reload request failed: Post \"http://localhost:9090/-/reload\": dial tcp [::1]:9090: connect: connection refused"