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Showing content from https://kubernetes-csi.github.io/docs/external-health-monitor-controller.html below:

health-monitor-controller - Kubernetes CSI Developer Documentation

1. 1. Introduction
2. 2. Developing a CSI Driver for Kubernetes
3. 1. 2.1. Versioning, Support, Compatibility Policies
   2. 2.2. Kubernetes Changelog
   3. 2.3. Kubernetes Cluster Controllers
   4. 1. 2.3.1. Snapshot Controller
      2. 2.3.2. Snapshot Validation Webhook
      3. 2.3.3. CSI Proxy
   5. 2.4. Sidecar Containers
   6. 1. 2.4.1. external-attacher
      2. 2.4.2. external-provisioner
      3. 2.4.3. external-resizer
      4. 2.4.4. external-snapshotter
      5. 2.4.5. livenessprobe
      6. 2.4.6. node-driver-registrar
      7. 2.4.7. cluster-driver-registrar
      8. 2.4.8. external-health-monitor-controller
      9. 2.4.9. external-health-monitor-agent
      10. 2.4.10. external-snapshot-metadata
   7. 2.5. CSI objects
   8. 1. 2.5.1. CSIDriver Object
      2. 2.5.2. CSINode Object
   9. 2.6. Features
   10. 1. 2.6.1. Secrets & Credentials
       2. 1. 2.6.1.1. StorageClass Secrets
          2. 2.6.1.2. VolumeSnapshotClass Secrets
          3. 2.6.1.3. VolumeGroupSnapshotClass Secrets
       3. 2.6.2. Topology
       4. 2.6.3. Raw Block Volume
       5. 2.6.4. Skip Attach
       6. 2.6.5. Pod Info on Mount
       7. 2.6.6. Volume expansion
       8. 2.6.7. Data Sources
       9. 1. 2.6.7.1. Cloning
          2. 2.6.7.2. Volume Snapshot & Restore
          3. 2.6.7.3. Volume Group Snapshot & Restore
       10. 2.6.8. Ephemeral Local Volumes
       11. 2.6.9. Volume Limits
       12. 2.6.10. Storage Capacity Tracking
       13. 2.6.11. Volume Health Monitoring
       14. 2.6.12. Token Requests
       15. 2.6.13. FSGroup Support
       16. 2.6.14. CSI Windows
       17. 2.6.15. Volume Mode Conversion
       18. 2.6.16. Cross-Namespace Data Sources
       19. 2.6.17. Changed Block Tracking
       20. 2.6.18. Volume Attributes Class
4. 3. Deploying a CSI Driver on Kubernetes
5. 1. 3.1. Example
6. 4. Driver Testing
7. 1. 4.1. Unit Testing
   2. 4.2. Functional Testing
8. 5. Drivers
9. 6. API Reference
10. 1. 6.1. Volume Snapshot
11. 7. Troubleshooting

Git Repository: https://github.com/kubernetes-csi/external-health-monitor

Status: Alpha

The CSI external-health-monitor-controller is a sidecar container that is deployed together with the CSI controller driver, similar to how the CSI external-provisioner sidecar is deployed. It calls the CSI controller RPC ListVolumes or ControllerGetVolume to check the health condition of the CSI volumes and report events on PersistentVolumeClaim if the condition of a volume is abnormal.

The CSI external-health-monitor-controller also watches for node failure events. This component can be enabled by setting the enable-node-watcher flag to true. This will only have effects on local PVs now. When a node failure event is detected, an event will be reported on the PVC to indicate that pods using this PVC are on a failed node.

CSI drivers that support VOLUME_CONDITION and LIST_VOLUMES or VOLUME_CONDITION and GET_VOLUME controller capabilities should use this sidecar container.

For detailed information (binary parameters, RBAC rules, etc.), see https://github.com/kubernetes-csi/external-health-monitor/blob/master/README.md.

The CSI external-health-monitor-controller is deployed as a controller. See https://github.com/kubernetes-csi/external-health-monitor/blob/master/README.md for more details.

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