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Redo Timer->Histogram move as Timer+Histogram for m3 stats (#653)

* Redo Timer->Histogram move as Timer+Histogram for m3 stats

PR#650 Replaced Timers with Histogram metrics, but to keep backward compatibility
and to not break existing alerts etc, we should have just made the additive change of
timer WITH histogram.

This makes that change.

* fix formatting

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8066 of 11900 relevant lines covered (67.78%)

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