Sweeping !20825 from 21.3 to 21.9. Merge branch 'master-Ftk-BMuMuX-monitoring' into 'master'

Atlas Nightlybuildrequested to merge
cherry-pick-badc81a38d-21.9 into 21.9

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

See merge request !20825 (merged)

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