On 15.09.20 12:41, 'Rong Hu' via Prometheus Users wrote:
> We would love to learn more about the roadmap for histogram improvements and
> rough timeline / estimates for earliest GA. We are trying to standardize our
> metrics on Prometheus internally and have lots of DDSketch histograms to
> migrate. In the short term we plan to roughly translate existing DDSketch
> buckets to default histogram buckets. It would greatly incentivize migration
> internally if the feature gap is filled.

I'm afraid that's right now bottlenecked on me. I'm doing the research
and gathering all the considerations right now to write up a document,
which can then be discussed and finalized by the community, so that we
then can all work together to implement it in Prometheus.

Since I kept getting distracted by "real life" things like ringing
pagers or "small" work commitments in my day job, it's hard to give a
reliably ETA even for publishing that doc, beyond "as soon as
possible". I'm very sorry for that. In any case, expect a very careful
discussion of the new concepts to introduce, and then an experimental
implementation that will take its time before it finds its way into
released versions of Prometheus. This is hard to get right in a way
that won't require another change very soon so we have to be careful
in what we promise as production-ready and what's still experimental.

I shared my current state in my recent KubeCon talk:
https://www.youtube.com/watch?v=HG7uzON-IDM

It's very well possible (and desirable) that similar approaches in
other mentrics system, like the DDSketch histograms, can be converted
into the new Prometheus histograms. But it's too early to guarantee
that.

-- 
Björn Rabenstein
[PGP-ID] 0x851C3DA17D748D03
[email] [email protected]

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