release-22.2:Backport!6850

Merged Andrey Vertiprahov requested to merge cherry-pick-bf6d8a0d into release-22.2

Juniper.JUNOS.get_metrics. Fix labels format on slot generator.

See merge request !6850 (merged)

(cherry picked from commit bf6d8a0d)

c8849e14 Juniper.JUNOS.get_metrics. Fix labels format on slot generator. cdb87536 Fix black.

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