Merge branch 'noc-1956' into 'master'

noc/noc#1956 Fix ZeroDivisionError when prefix usage calc.

See merge request !6854

(cherry picked from commit f190b612)

063c4f76 Fix ZeroDivisionError when prefix usage calc.
6 jobs for !6856 with cherry-pick-f190b612 in 17 minutes and 19 seconds (queued for 5 seconds)
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