Metrics

• carina-node runs in hostNetwork mode and listens to 8080.

          - "--metrics-addr=:8080"

If changing those ports, please also change the csi-carina-node service.

• carina-controller listens to 8080 8443.

          - "--metrics-addr=:8080"
          - "--webhook-addr=:8443"

• metrics from carina-nodecarina-controller

  	# Free bytes in VG:  carina-devicegroup-vg_free_bytes
  	# Total bytes of VG:  carina-devicegroup-vg_total_bytes
  	# Total bytes of volume:  carina-volume-volume_total_bytes
  	# Used bytes of volume:  carina-volume-volume_used_bytes

• Volume usage is calculated from LVM, it may diffs with df -h about dozens of MB.
• Carina-controller has all data from each carina-node. So actually, just getting metrics from carina-controller is enough.
• User can deploy serviceMonitor(deployment/kubernetes/prometheus.yaml.tmpl) in case of prometheus.
• For pvc metrics, user can still query from kubelet.