release-19.4:Backport!3162

Merged Andrey Vertiprahov requested to merge cherry-pick-0b9311de into release-19.4

Fix interface_flap field on ReportMetrics.

See merge request !3162 (merged)

(cherry picked from commit 0b9311de)

2d4faea3 Fix interface_flap field on ReportMetrics. 80a760ab Fix black.

Edited by Andrey Vertiprahov

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