On Fri, Nov 27, 2020 at 10:41 AM b.ca...@pobox.com <b.cand...@pobox.com>
wrote:

> > Soon! https://github.com/prometheus/prometheus/pull/8084
>
> That'll be a cool feature for data migration - thanks!
>
> Unfortunately I don't think it helps with the OP's problem, unless:
> 1. federation is extended to query historical data (with range queries?)
> 2. prometheus supports a remote_write endpoint for backfilling
>

No, it doesn't solve federation gaps. Only remote_write and Thanos do this
correctly.

IMO, Federation is mostly useful in extremely high-scale environments where
the metrics on the "scrape Prometheus" instances are mostly used for
recording rule rollups, and only the federation data is used.

WIth remote_write and Thanos, I mostly see Federation as a legacy
technique. It was an easy form of rollup and aggregation for large scale
that was implemented in the early days.


>
> I can suggest another option for the OP though. They can run *two*
> independent federation nodes, such that they are never both down at the
> same time. Then put promxy <https://github.com/jacksontj/promxy> in front
> of them, and query via that.  At query time, it will fill gaps in one
> server with data from the other.
>
> Re Thanos: is there a simple one-process deployment for that yet?  What I
> like about VictoriaMetrics is that I can run
> /opt/victoria-metrics/victoria-metrics-prod 
> -storageDataPath=/var/lib/victoria-metrics/data
> -retentionPeriod=6 \
>     -httpAuth.username=admin -httpAuth.password=XXXXXX
> and I'm done.
>
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