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docs: Update federation docs for native histograms

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Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
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Ganesh Vernekar 2023-01-12 13:33:45 +05:30
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docs/federation.md
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@ -8,8 +8,15 @@ sort_rank: 6
Federation allows a Prometheus server to scrape selected time series from
another Prometheus server.
_Note about native histograms (experimental feature): Federation does not
support native histograms yet._
_Note about native histograms (experimental feature): To scrape native histograms
via federation, the scraping Prometheus server needs to run with native histograms
enabled (via the command line flag `--enable-feature=native-histograms`), implying
that the protobuf format is used for scraping. Should the federated metrics contain
a mix of different sample types (float64, counter histogram, gauge histogram) for
the same metric name, the federation payload will contain multiple metric families
with the same name (but different types). Technically, this violates the rules of
the protobuf exposition format, but Prometheus is nevertheless able to ingest all
metrics correctly._
## Use cases