The prometheus-k8s monitoring targets show some endpoints to be DOWN.

Issue

• The prometheus-k8s monitoring targets show some endpoints to be DOWN.

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cluster-monitoring-operator (0/1 up) 
Endpoint    State   Labels  Last Scrape Error
http://x.x.x.x:8080/metrics
DOWN    endpoint="http" instance="x.x.x.x:8080" namespace="openshift-monitoring" pod="cluster-monitoring-operator-xxxxxxxx" service="cluster-monitoring-operator"   39.59s ago  context deadline exceeded

kube-controllers (0/3 up) 
Endpoint    State   Labels  Last Scrape Error
https://x.x.x.x:8444/metrics
DOWN    endpoint="http-metrics" instance="x.x.x.x:8444" namespace="kube-system" pod="master-controllers-abc-001.p20.internal" service="kube-controllers"    24.982s ago context deadline exceeded
https://x.x.x.x:8444/metrics
DOWN    endpoint="http-metrics" instance="x.x.x.x:8444" namespace="kube-system" pod="master-controllers-abc-002.p20.internal" service="kube-controllers"    32.62s ago  context deadline exceeded
https://x.x.x.x:8444/metrics
DOWN    endpoint="http-metrics" instance="x.x.x.x:8444" namespace="kube-system" pod="master-controllers-abc-003.p20.internal" service="kube-controllers"    39.155s ago context deadline exceeded
........