chore: refactor metrics pkg

[hccheng72]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Refactoring metrics package for consistency across csi drivers.

Which issue(s) this PR fixes:
Unify latency log format across csi drivers with the change in the blob driver kubernetes-sigs/blob-csi-driver#2326

Fixes #

Requirements:

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

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

Hi @hccheng72. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[andyzhangx]

/ok-to-test

[Copilot]

Pull request overview

Refactors the CSI metrics package to standardize label keys, add structured latency logging context (volume-related key/value pairs), and updates Azure File CSI controller/node code to use the refactored metrics context for more consistent latency logs across drivers.

Changes:

• Extend CSIMetricContext with WithBasicVolumeInfo, WithAdditionalVolumeInfo, and WithLogLevel, plus structured latency logging.
• Replace hard-coded metric label keys with exported constants (Protocol, StorageAccountType).
• Update Azure File controller/node operations and metrics unit tests/benchmarks to use the new context APIs.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 12 comments.

File	Description
pkg/metrics/metrics.go	Adds volume context + log level to metric context and emits structured latency logs; introduces label key constants.
pkg/metrics/metrics_test.go	Updates tests to use basic volume info + label constants; adds tests for new APIs; adjusts timing test/benchmarks.
pkg/azurefile/nodeserver.go	Switches Node* operations to use pkg/metrics CSI context and adds volume info to latency logs.
pkg/azurefile/controllerserver.go	Switches controller operations to CSI context (incl. protocol/account-type labels) and removes dependency on cloud-provider-azure metrics for these paths.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[andyzhangx]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, hccheng72

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [andyzhangx]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[andyzhangx]

/cherrypick release-1.35

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #2975

Details

In response to this:

/cherrypick release-1.35

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.