This is a clone of issue OCPBUGS-56115. The following is the description of the original issue:
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Description of problem:

In some must gathers and local tests, there are logs starting with `error getting existing MCN` being emitted from the upgrade monitor. These logs do not appear to correspond with fatal errors nor do they seem to relate to issues with functionality. Thus, we should work to understand what causes these alerts and possibly rework or update the conditionals for these alerts.

Version-Release number of selected component (if applicable):

Seen in testing on 4.20, but possibly also present in 4.19 and prior.

How reproducible:

Unsure.

Steps to Reproduce:

These logs can be seen in:

• The logs of a successful payload rehearsal found here
• The MCD logs of a SNO cluster on 4.20 with techpreview enabled

Actual results:

Tests seem to pass and functionality seems fine, but the MCD has logs indicating an error has occurred.

Expected results:

Confusing error messages should not occur. If warnings are still relevant in the edge cases when these alerts are emitted, the content of the alert should be clarified.

Additional info:

N/A