Changelog:
ff2043f ceph_key: handle error in a better way
77f32a3 container: set tcmalloc value by default
a6cf646 dashboard: Add new prometheus alert
f0413c4 update: do not gather facts on each play
5fa7102 tests: remove legacy file
8802dcf shrink-mgr: modify existing mgr check
31ad2d9 workflows: add signed-off check
e899b84 workflow: add group_vars/defaults checks
d22406b workflow: add syntax check
6959540 workflow/lint: pin ruamel.yaml.clib to 0.2.2
6f3dc45 tox: add ceph_stable_release to switch2container
25ea12d switch2container: run ceph-validate role