feat: Instrument node metrics for unexpected device path changes

[tonyzhc]

What type of PR is this?

/kind feature

What this PR does / why we need it:
Adds a new metric, unexpected_device_path_changes, to track unexpected device path changes. This metric is incremented whenever the device path for a volume changes, as detected by the linkcache's periodic check.

This helps in monitoring and alerting on potentially unstable device paths, which can be an indicator of underlying issues.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Add a new node server metric `unexpected_device_path_changes` to track unexpected device path changes.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: tonyzhc / name: Hanchi Zhang (76d8e7c)

[mattcary]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mattcary, tonyzhc

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• OWNERS [mattcary]

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[tonyzhc]

@mattcary could you LGTM again?

[mattcary]

/lgtm

[k8s-ci-robot]

@tonyzhc: The following tests 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-gcp-compute-persistent-disk-csi-driver-e2e-windows-2019	2264426	link	false	/test pull-gcp-compute-persistent-disk-csi-driver-e2e-windows-2019
pull-gcp-compute-persistent-disk-csi-driver-e2e-arm	76d8e7c	link	false	/test pull-gcp-compute-persistent-disk-csi-driver-e2e-arm

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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[mattcary]

/lgtm

[tonyzhc]

/cherry-pick 1.21

[k8s-infra-cherrypick-robot]

@tonyzhc: cannot checkout 1.21: error checking out "1.21": exit status 1 error: pathspec '1.21' did not match any file(s) known to git

Details

In response to this:

/cherry-pick 1.21

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.

[tonyzhc]

/cherry-pick release-1.21

[k8s-infra-cherrypick-robot]

@tonyzhc: new pull request created: #2223

Details

In response to this:

/cherry-pick release-1.21

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.