JIT: Metrics show changes even with no-diff changes

[jakobbotsch]

E.g. https://dev.azure.com/dnceng-public/public/_build/results?buildId=1339686&view=ms.vss-build-web.run-extensions-tab has no diffs, yet several metrics show up as changing. We probably should increase the expected variance of these metrics so that they don't show up unless they are actually changing.

cc @EgorBo

[EgorBo]

Makes sense, would be interesting to know what exactly causes the difference, though.

[jakobbotsch]

Yes... Especially GCInfoBytes. That seems problematic if that isn't deterministic.

[EgorBo]

I'll spin it locally to see if I can repro

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