Does Prometheus optimise storage for non-changing metrics?

[John Dexter]

I have a counter metric with a label which has quite a few possible values. However in reality many of these labeled metrics change very rarely and some of them might never change depending on the system.

Does Prometheus intelligently handle storage in such cases? i.e. only record changes to values so I don't have millions of copies of "0.0" recorded each poll?

Thanks.

[Ben Kochie]

Yes, Prometheus uses "Double Delta" and other compression techniques to reduce these to a few bits per sample.

There's a good video about this: https://youtu.be/b_pEevMAC3I

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