Merge branch 'fix-avs-escalation-key-error' into 'master'

Check  TT on already_escalation method for fix Key Error when check notification doc.

See merge request !6248

(cherry picked from commit b9fb002e)

e0d7d492 Check  TT on already_escalation method for fix Key Error when check notification doc.
6 jobs for !6251 with cherry-pick-b9fb002e in 18 minutes and 13 seconds (queued for 3 seconds)
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