Investigation for PruningCronjob Error [In Testing]

[aliceh]

In this PR I add an investigation for https://github.com/openshift/ops-sop/blob/master/v4/alerts/PruningCronjobErrorSRE.md

[aliceh]

/hold

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: aliceh
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[openshift-ci]

@aliceh: 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
ci/prow/coverage	4edb330	link	true	/test coverage
ci/prow/test	4edb330	link	true	/test test
ci/prow/lint	4edb330	link	true	/test lint

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