Sweeping !20825 from 21.3 to 21.9. Merge branch 'master-Ftk-BMuMuX-monitoring' into 'master' (!20891) · Merge requests · atlas / athena · GitLab

Atlas Nightlybuild requested to merge cherry-pick-badc81a38d-21.9 into 21.9 Feb 05, 2019

Merge branch 'master-Ftk-BMuMuX-monitoring' into 'master'

See merge request !20825 (merged)