release-23.1:Backport!7354

Merged Andrey Vertiprahov requested to merge cherry-pick-98aa1531 into release-23.1

Extreme.XOS. Convert CPU Usage metric to float (device return string).

See merge request !7354 (merged)

(cherry picked from commit 98aa1531)

8f2a5f7a Extreme.XOS. Convert CPU Usage metric to float (device return string).

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