[release-1.15] [metrics] Fix panic during metrics manager startup #1898
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This fixes a regression introduced in kubernetes-sigs#1876 where the driver would start panicking on startup if `--http-endpoint` was specified. This was caused by the metrics not being initialized anymore during startup. The proposed fix involves using the `Reset` methods of the metrics object instead of trying to redefine them each time they need to be reset.
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: k8s-infra-cherrypick-robot, leiyiz The full list of commands accepted by this bot can be found here. The pull request process is described here
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This is an automated cherry-pick of #1895
/assign leiyiz