chore: refine prometheus metrics

[andyzhangx]

What type of PR is this?
/kind feature

What this PR does / why we need it:
chore: refine prometheus metrics

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

"Observed Request Latency" latency_seconds=2.488289745 request="azuredisk_csi_driver_controller_create_volume" resource_group="kubetest-8a9dk4r1" subscription_id="0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e" source="disk.csi.azure.com" /subscriptions/0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e/resourceGroups/kubetest-8a9dk4r1/providers/Microsoft.Compute/disks/pvc-34bd9b6b-e3d7-4c24-bc5f-d76e206cbaca="" result_code="succeeded"
"Observed Request Latency" latency_seconds=5.252537262 request="azuredisk_csi_driver_controller_delete_volume" resource_group="kubetest-8a9dk4r1" subscription_id="0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e" source="disk.csi.azure.com" /subscriptions/0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e/resourceGroups/kubetest-8a9dk4r1/providers/Microsoft.Compute/disks/pvc-34bd9b6b-e3d7-4c24-bc5f-d76e206cbaca="" result_code="succeeded"
"Observed Request Latency" latency_seconds=35.669521545 request="azuredisk_csi_driver_controller_publish_volume" resource_group="kubetest-8a9dk4r1" subscription_id="0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e" source="disk.csi.azure.com" /subscriptions/0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e/resourceGroups/kubetest-8a9dk4r1/providers/Microsoft.Compute/disks/pvc-34bd9b6b-e3d7-4c24-bc5f-d76e206cbaca=k8s-agentpool1-35106576-1 result_code="succeeded"
"Observed Request Latency" latency_seconds=15.683682928 request="azuredisk_csi_driver_controller_unpublish_volume" resource_group="kubetest-8a9dk4r1" subscription_id="0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e" source="disk.csi.azure.com" /subscriptions/0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e/resourceGroups/kubetest-8a9dk4r1/providers/Microsoft.Compute/disks/pvc-34bd9b6b-e3d7-4c24-bc5f-d76e206cbaca=k8s-agentpool1-35106576-1 result_code="succeeded"
"Observed Request Latency" latency_seconds=2.5004776079999997 request="azuredisk_csi_driver_controller_create_snapshot" resource_group="kubetest-8a9dk4r1" subscription_id="0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e" source="disk.csi.azure.com" /subscriptions/0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e/resourceGroups/kubetest-8a9dk4r1/providers/Microsoft.Compute/disks/pvc-474d99a4-3561-40a0-a70f-17983abd8a2d="snapshot-cac2ced8-5684-44c7-96d9-1a2be1a5872c" result_code="succeeded"
"Observed Request Latency" latency_seconds=5.21112229 request="azuredisk_csi_driver_controller_delete_snapshot" resource_group="kubetest-8a9dk4r1" subscription_id="0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e" source="disk.csi.azure.com" /subscriptions/0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e/resourceGroups/azuredisk-csi-driver-test-cf17c544-a75f-11ec-8556-12364907c084/providers/Microsoft.Compute/snapshots/snapshot-cac2ced8-5684-44c7-96d9-1a2be1a5872c="" result_code="succeeded"
"Observed Request Latency" latency_seconds=0.020298546 request="azuredisk_csi_driver_controller_expand_volume" resource_group="kubetest-8a9dk4r1" subscription_id="0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e" source="disk.csi.azure.com" /subscriptions/0e46bd28-a80f-4d3a-8200-d9eb8d80cb2e/resourceGroups/kubetest-

Release note:

none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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[andyzhangx]

/test pull-azuredisk-csi-driver-e2e-capz

[andyzhangx]

/test pull-azuredisk-csi-driver-e2e-capz

[andyzhangx]

/test pull-azuredisk-csi-driver-e2e-capz

[andyzhangx]

/test pull-azuredisk-csi-driver-e2e-capz

[k8s-ci-robot]

@andyzhangx: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-azuredisk-csi-driver-e2e-capz	3301b8b	link	false	/test pull-azuredisk-csi-driver-e2e-capz

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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