Horizontal Pod Autoscaler - failed to get CPU consumption and request: metrics obtained for X/Y of pods

Solution In Progress - Updated -

Issue

Horizontal Pod Autoscaler (HPA) not working after pods being running for a while and errors similar to the ones below are seen in the monitoring tab or events log:

 12d           1m              15563   {horizontal-pod-autoscaler }                    Warning         FailedGetMetrics        failed to get CPU consumption and request: metrics obtained for 1/2 of pods
  12d           1m              15563   {horizontal-pod-autoscaler }                    Warning         FailedComputeReplicas   failed to get CPU utilization: failed to get CPU consumption and request: metrics obtained for 1/2 of pods
  12d           9s              15863   {horizontal-pod-autoscaler }                    Warning         FailedGetMetrics        failed to get CPU consumption and request: metrics obtained for 0/2 of pods
  12d           9s              15863   {horizontal-pod-autoscaler }                    Warning         FailedComputeReplicas   failed to get CPU utilization: failed to get CPU consumption and request: metrics obtained for 0/2 of pods

Environment

OpenShift Container Platform 3.X

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