Add more info to disk metrics

[vteratipally]

Adds labels to the metric disk_usage_bytes fstypes and mount points as the additional information that would help in analyzing and monitor the use of the file systems

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[k8s-ci-robot]

Hi @vteratipally. Thanks for your PR.

I'm waiting for a kubernetes 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.

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[vteratipally]

/cc @ForestCold

[k8s-ci-robot]

@vteratipally: GitHub didn't allow me to assign the following users: Forestcold.

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In response to this:

/assign @ForestCold

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[Random-Liu]

nit: fstypeLabel/fsTypeLabel?

[Random-Liu]

It seems that a newline is missing at the end of the file.

[Random-Liu]

/ok-to-test

[vteratipally]

/test pull-npd-e2e-kubernetes-gce-gci

[Random-Liu]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Random-Liu, vteratipally

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[vteratipally]

/retest