Merge PR #25620 into master

* refs/pull/25620/head:
	os/bluestore: more robust handling for lack of per-pool stats cases.

Reviewed-by: Sage Weil <sage@redhat.com>

diff --cc src/common/legacy_config_opts.h
Simple merge

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

diff --cc src/os/bluestore/BlueStore.cc
Simple merge