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Eventrouter

Receives Kubernetes events and turns them into Prometheus metrics.

Important Events

Good background information on watching Kubernetes events

  • CrashLoopBackOff - which happens when a pod starts, crashes, starts again, and then crashes again
  • ImagePullBackOff - which happens when the node is unable to retrieve the image
  • Evicted - which can happen when a node determines that a pod needs to be evicted or terminated to free up some resources (CPU, memory...etc). When this happens, K8s is supposed to reschedule the pod on another node
  • FailedMount / FailedAttachVolume - when pods require a persistent volume or storage, this event prevents them from starting if the storage is not accessible
  • FailedSchedulingEvents - when the scheduler is not able to find a node to run your pods
  • NodeNotReady - when a node cannot be used to run a pod because of an underlying issue
  • Rebooted
  • HostPort Conflict

TODO

  • Investigate possible pruning options for message to reduce cardinality.