Merge PR #25360 into master

Merge PR #25360 into master

* refs/pull/25360/head:
	qa/workunits/mon/pg_autoscaler: clean up pools afterwards
	qa/suites/rados/singletone/all/pg-autoscaler: whitelist health warnings
	qa/tasks/ceph: wait for splits/merges before final scrub
	mon/OSDMonitor: be tidy with target_size_ratio and pre-nautilus code
	mgr/pg_autoscaler: simplify conditions
	qa/suites/rados: add simple pg-autoscaler test
	qa/workunits/cephtool/test.sh: pg_autoscale_mode=off while testing pg_num etc
	doc/rados/operations: document autoscaler and its health warnings
	mgr/pg_autoscaler: add pg autoscaler module
	pybind/mgr/mgr_util: move format_ helpers out of status module
	mon/OSDMonitor: accept optional target_size_{bytes,ratio} to 'osd pool create'
	mon/OSDMonitor: remove max_split_count configurable
	osd/osd_types: pool_opts_t: int -> int64_t
	osd/osd_types: pool_opts: fix whitespace
	osd/osd_types: pool_opts_t: make encoding feature-dependent
	mgr/devicehealth: pg_num_min 1 for device_health_metrics pool
	mon/OSDMonitor: accept optional pg_num_min to 'osd pool create'
	mon/OSDMonitor: apply osd_pool_default_pg_autoscale_mode to new pools
	pybind/mgr/mgr_module: some accessors
	mon/MgrMonitor: enable progress module by default
	osd/osd_types: add pool pg_autoscale_mode, pg_num_min, target_size_{bytes,ratio} properties
	osdc/Objecter: revise get_latest_version locking
	os/memstore: ignore OP_COLL_SET_BITS
	qa: generalise REQUIRE_MEMSTORE
	mgr: drop GIL in get_config
	mon: add 'size' arg to `osd pool create`
	mon: use pg_num_target for checks during creation
	mgr: revise locking in getter paths
	common/options: add `mon_target_pg_per_osd`
	mgr: expose OSDMap.pool_raw_used_rate

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