Merge PR #24247 into master

* refs/pull/24247/head:
	PendingReleaseNotes: add note about increased mon memory footprint
	doc/start/hardware-recommendations: refresh recommendations for RAM
	rocksdb: increase default cache size to 512 MB
	mon: mon_osd_cache_size = 500 (from 10)

Reviewed-by: Neha Ojha <nojha@redhat.com>
Reviewed-by: Josh Durgin <jdurgin@redhat.com>
Reviewed-by: Greg Farnum <gfarnum@redhat.com>

diff --cc PendingReleaseNotes
Simple merge

diff --cc src/common/options.cc
Simple merge