NO-JIRA: Fix error logging in metrics server.go

[jmencak]

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[ffromani]

/lgtm

[ffromani]

we may need a NO-JIRA here

[openshift-ci-robot]

@jmencak: This pull request explicitly references no jira issue.

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[ffromani]

/retest

need to deep dive about these failures

[jmencak]

/retest

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[ART PR BUILD NOTIFIER]

This PR has been included in build cluster-node-tuning-operator-container-v4.16.0-202312140031.p0.g29d73bd.assembly.stream for distgit cluster-node-tuning-operator.
All builds following this will include this PR.