Emit Ecto query metrics

Added

• Emit distribution metrics from the Ecto integration.

  Each Ecto query telemetry event now also reports its timing values as ecto_query_time, ecto_queue_time, ecto_decode_time, ecto_idle_time and ecto_total_time distribution metrics.

  All five metrics are tagged by repo and hostname. The ecto_query_time, ecto_decode_time and ecto_total_time metrics are additionally tagged by repo and source (the Ecto table).

  This surfaces pool waits, decode time, idle connection time and per-table latency as standalone metrics in addition to the existing query span.

Fixed

• Preserve sub-millisecond precision when reporting timing distribution metrics.

  The Ecto (ecto_query_time, ecto_queue_time, ecto_decode_time, ecto_idle_time, ecto_total_time) and Oban (oban_job_duration, oban_job_queue_time) distribution metrics now report fractional milliseconds, instead of being truncated to whole milliseconds. Sub-millisecond measurements were previously rounded down to zero.

View the Elixir package v2.17.2 changelog for more information.