Merge PR #32786 into master

* refs/pull/32786/head:
	mon/ConfigMonitor: put global/ keys in global section
	mon/ConfigMonitor: transition old keys to have global/ prefix
	mon/ConfigMonitor: always prefix global config keys with global/
	mon/ConfigMonitor: switch to use pending_cleanup boost::optional

Reviewed-by: Neha Ojha <nojha@redhat.com>