Merge PR #54485 into main

* refs/pull/54485/head:
	mds/quiesce-db: keep the db thread alive until shutdown
	mds/quiesce-db: incorporate review comments
	mds/quiesce: declare QuiesceDbPeerListing and QuiesceDbPeerAck
	mds/quiesce: resolve the quiesce cluster at the mds monitor
	include/types: add an I/O helper for std::unordered_map
	messages: avoid using mutable members in MMDSQuiesce*
	mds/quiesce-db: incorporate review comments
	doc/cephfs/fs-volumes: doc fixes and updates
	pybind/mgr: correct type hints for `get_quiesce_leader_info`
	mds/quiesce: only use ACTIVE daemons for the quiesce cluster
	mds,messages: quiesce db inter-rank messaging
	mds/quiesce: MDSRankQuiesce - integration of the quiesce db manager
	doc/cephfs/fs-volumes: Add info about the quiesce command
	doc: fixes for local dev builds
	mgr/volumes: support for `fs subvolume quiesce`
	mgr/volumes: use `volume_exception_to_retval` as a decorator
	pybind/mgr: add a `one-shot` parameter to send_command
	mds/quiesce: QuiesceAgent implementation and unit tests
	mds/quiesce: QuiesceDb.h and QuiesceDbManager with tests
	common/Timer.cc: improve debug messages from the timer_thread
	mds: MDSRank.cc: return status from `send_message_mds`
	encoding: add emplace variants for map dencoders
	common/Cond: make C_SaferCond private members protected to facilitate inheritance
	qa/tasks/cephfs: give the tests more time to run heavy fs workloads

Reviewed-by: Venky Shankar <vshankar@redhat.com>
Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>

diff --cc src/client/Client.cc
Simple merge

diff --cc src/client/Client.h
Simple merge

diff --cc src/mds/MDSRank.cc
Simple merge