Handle merging things properly for monitoring

General MR

Summary

Makes sure that values are maps before we try to check the .skipOverlayMerge value.

Can be tested by overriding monitoring.values.domain.

changed milestone to %1.56.0

added monitoring statusreview labels

assigned to @micah.nagel

requested review from @ryan.j.garcia

approved this merge request

merged

mentioned in commit 1cf45051