Commits on Aug 31, 2023

1. pkg/metrics: use native histograms behind an environment flag. …

   Optionally enable prometheus native histograms. Native histograms are
   sparse histograms with exponentially spaced buckets that require minimal
   configuration. They are also represented as a single series, rather than
   a series per bucket as for conventional histograms. As a result, native
   histograms typically require less memory and storage and offer higher
   precision relative to conventional histograms.
   
   This patch enables support for native histograms behind the
   COCKROACH_ENABLE_PROMETHEUS_NATIVE_HISTOGRAMS environment variable flag.
   We use a flag because native histograms are currently considered
   experimental in prometheus. To use this feature, set the
   COCKROACH_ENABLE_PROMETHEUS_NATIVE_HISTOGRAMS environment variable to
   "true", and enable native histogram support in prometheus by setting
   --enable-feature=native-histograms in the server arguments. Note that
   crdb exports both conventional and native histograms when native
   histogram support is enabled; prometheus can be configured to scrape
   either or both.
   
   Prometheus native histograms currently only support exponentially spaced
   buckets, so we also limit their use to metrics with an exponential
   distribution. Note that native histograms currently use the protobuf
   exposition format, so we add content negotiation to the prometheus
   exporter.
   
   Epic: https://cockroachlabs.atlassian.net/browse/CC-9716
   
   Release note (ops change): Added support for prometheus native
   histograms behind an environment variable flag.

   

   jmcarp committed Aug 31, 2023
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