vmalertmanager additional storage types

[mnacharov]

I want to use GCP FUSE CSI driver as a storage for alertmanager.
According to the API Docs, I cannot do it, because storage should be either emptyDir or volumeClaimTemplate, but I need to have something like this:

  volumes:
  - name: vmalertmanager-db
    csi:
      driver: gcsfuse.csi.storage.gke.io
      volumeAttributes:
        bucketName: alertmanagers-data
        mountOptions: "implicit-dirs"

I think it should be possible to specify `/alertmanager´ in volumeMounts and any volume you like for it, because installations are different. The emptyDir and volumeClaimTemplate don't cover all the cases.

[AndrewChubatiuk]

to support NFS for alertmanager storage path should be changed from /alertmanager to /alertmanager/${pod-name} (which is a breaking change) otherwise setup with more than 1 replica and NFS will fail

[AndrewChubatiuk]

@mnacharov
you can move CSI settings to storage class

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  namespace: gcs-fuse-example
provisioner: gcsfuse.csi.storage.gke.io
volumeBindingMode: Immediate
reclaimPolicy: Delete
parameters:
  bucketName: example-alertmanager-data
  mountOptions: "implicit-dirs"

and then reference it in volumeClaimTemplate

apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAlertmanager
metadata:
  name: example
spec:
  podMetadata:
    annotations:
      gke-gcsfuse/volumes: "true"
  storage:
    volumeClaimTemplate:
      spec:
        storageClassName: gcs-fuse-example
        accessModes:
          - ReadWriteMany
        resources:
          requests:
            storage: 2Gi