Merge branch 'fix-avs-calculate-delta-metrics' into 'master'

Fix calculate MetricType for delta type.

See merge request !6885

(cherry picked from commit a2a6b4f2)

41878b1c Fix calculate MetricType for delta type.
67567994 Fix Probe.get_value.
e8f4137f Add is_delta to collection.
8 jobs for !6889 with cherry-pick-a2a6b4f2 in 17 minutes and 27 seconds (queued for 8 seconds)
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