I was trying to add this sidecar to my CSI driver, but my pod was stuck in a CrashLoopBackOff state. kubectl logs mydriverpod -c csi-health-monitor was unhelpful:

$ kubectl logs -n kubesan-system csi-controller-plugin-65776bcb7-68mm8 -c csi-health-monitor
I0116 18:48:15.917448       1 main.go:104] "Version" version="v0.14.0"
I0116 18:48:15.919201       1 common.go:143] "Probing CSI driver for readiness"
$ 

I traced it down to a missing advertisement of csi.ControllerServiceCapability_RPC_LIST_VOLUME_CONDITION in my ControllerGetCapabilities() gRPC call, but it took me adding a --v=2 argument to the command line of the sidecar.

Best practice when failing fast due to misconfiguration is to be verbose about what was misconfigured, rather than hiding it behind V(2), so that the logs can serve as a useful pointer for how to correct the misconfiguration.