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Version: 3.9

Ledger Alerts

LedgerClusterDown​

This is the most critical alert and indicates that an Ledger cluster is not able to process requests. This alert should be handled with the highest priority.

Example Alert​

Firing​

[FIRING:1] LedgerClusterDown - critical
Alert: Ledger cluster is down - critical
 Description: Ledger cluster is down, no resquest can be process.
 Details:
  • alertname: LedgerClusterDown
  • deployment: prod-scalardl-ledger

Resolved​

[RESOLVED] LedgerClusterDown - critical
Alert: Ledger cluster is down - critical
 Description: Ledger cluster is down, no resquest can be process.
 Details:
  • alertname: LedgerClusterDown
  • deployment: prod-scalardl-ledger

Action Needed​

  • Check the number of replicas set kubectl get deployments. prod-scalardl-ledger
  • Check the number of replicas set kubectl describe deployments. prod-scalardl-ledger
  • Check nodes statuses with kubectl get node -o wide
  • Check the log server to pinpoint the root cause of a failure with kubernetes logs on the monitor server /log/kubernetes/<year>/<month>-<day>/kube.log
  • Check a cloud provider to see if there is any known issue. For example, you can check statues here in Azure.

LedgerClusterDegraded​

This alert lets you know if a kubernetes cluster cannot start ledger pods, which means that the cluster does not have enough resource or lost of one or many kubernetes nodes to run the deployment.

Example Alert​

Firing​

[FIRING:1] LedgerClusterDegraded - warning
Alert: Ledger cluster is running in a degraded mode - warning
 Description: Ledger cluster is running in a degraded mode, some of the Ledger pods are not healthy.
 Details:
  • alertname: LedgerClusterDegraded
  • deployment: prod-scalardl-ledger

Resolved​

[RESOLVED] LedgerClusterDegraded - warning
Alert: Ledger cluster is running in a degraded mode - warning
 Description: Ledger cluster is running in a degraded mode, some of the Ledger pods are not healthy.
 Details:
  • alertname: LedgerClusterDegraded
  • deployment: prod-scalardl-ledger

Action Needed​

  • Check the log server to pinpoint the root cause of a failure with kubernetes logs on the monitor server /log/kubernetes/<year>/<month>-<day>/kube.log
  • Check kubernetes deployment with kubectl describe deployments prod-scalardl-ledger
  • Check replica set with kubectl get replicasets.apps
  • Check nodes statuses with kubectl get node -o wide
  • Check a cloud provider to see if there is any known issue. For example, you can check statues here in Azure.

LedgerPodsPending​

This alert lets you know if a kubernetes cluster cannot start ledger pods, which means that the cluster does not have the enough resource.

Example Alert​

Firing​

[FIRING:1] LedgerPodsPending - warning
Alert: Pod prod-scalardl-ledger-xxxx-yyyy in namespace default in pending status - warning
 Description: Pod prod-scalardl-ledger-xxxx-yyyy in namespace default has been in pending status for more than 1 minute.
 Details:
  • alertname: LedgerPodsPending
  • deployment: prod-scalardl-ledger

Resolved​

[RESOLVED:1] LedgerPodsPending - warning
Alert: Pod prod-scalardl-ledger-xxxx-yyyy in namespace default in pending status - warning
 Description: Pod prod-scalardl-ledger-xxxx-yyyy in namespace default has been in pending status for more than 1 minute.
 Details:
  • alertname: LedgerPodsPending
  • deployment: prod-scalardl-ledger

Action Needed​

  • Check log server to pinpoint root cause of failure with the kubernetes logs on the monitor server /log/kubernetes/<year>/<month>-<day>/kube.log
  • Check the kubernetes deployment with kubectl describe pod prod-scalardl-ledger-xxxx-yyyy

LedgerPodsError​

This alert lets you know if a kubernetes cluster cannot start ledger pods for one of the following reasons:

  • CrashLoopBackOff
  • CreateContainerConfigError
  • CreateContainerError
  • ErrImagePull
  • ImagePullBackOff
  • InvalidImageName

Example Alert​

Firing​

[FIRING:1] LedgerPodsError - warning
Alert: Pod prod-scalardl-ledger-xxxx-yyyy in namespace default has an error status - warning
 Description: Pod prod-scalardl-ledger-xxxx-yyyy in namespace default has been in pending status for more than 1 minutes.
 Details:
  • alertname: LedgerPodsError
  • deployment: prod-scalardl-ledger

Resolved​

[RESOLVED:1] LedgerPodsError - warning
Alert: Pod prod-scalardl-ledger-xxxx-yyyy in namespace default has an error status - warning
 Description: Pod prod-scalardl-ledger-xxxx-yyyy in namespace default has been in pending status for more than 1 minutes.
 Details:
  • alertname: LedgerPodsError
  • deployment: prod-scalardl-ledger

Action Needed​

  • Check the kubernetes deployment with kubectl describe pod prod-scalardl-ledger-xxxx-yyyy
  • Check log server to pinpoint root cause of failure with the kubernetes logs on the monitor server /log/kubernetes/<year>/<month>-<day>/kube.log