alerts PrometheusNotIngestingSamples / PrometheusNotConnectedToAlertmanagers activated and scrape manager errors in prometheus

Solution Verified - Updated -

Issue

  • AlertManager receiving suddenly multiple alert on my production cluster as alert manager is not connected and not ingesting samples

  • Errors seen in logs:

2020-10-20T00:50:04.712528301Z level=warn ts=2020-10-20T00:50:04.712Z caller=klog.go:86 component=k8s_client_runtime func=Warningf msg="github.com/prometheus/prometheus/discovery/kubernetes/kubernetes.go:263: watch of *v1.Endpoints ended with: too old resource version: 57991441 (57993667)"
2020-10-20T00:50:39.714115125Z level=warn ts=2020-10-20T00:50:39.714Z caller=klog.go:86 component=k8s_client_runtime func=Warningf msg="github.com/prometheus/prometheus/discovery/kubernetes/kubernetes.go:263: watch of *v1.Endpoints ended with: too old resource version: 57993274 (57993834)"

Environment

  • Red Hat OpenShift Container Platform
    • 4.3-4.5

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