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electric
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Postgres sync engine. Sync little subsets of your Postgres data into local apps and services.
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lib/electric/telemetry/sampler.ex
defmodule Electric.Telemetry.Sampler do
@moduledoc """
Decides which spans should be included and how often.
This deviates from the standard way to OpenTelemetry sampling by sampling as the spans are created.
This is done to avoid the overhead of creating spans that will not be recorded.
Child spans of a sampled span should use `OpenTelemetry.with_child_span/4` to ensure that
they are only sampled if the parent span is sampled.
"""
def include_span?(name) do
!excluded?(name) && included?(name)
end
defp included?("filter." <> _), do: Application.get_env(:electric, :profile_where_clauses?)
defp included?("pg_txn.replication_client.transaction_received"), do: sample?()
defp included?(_), do: true
defp excluded?(name) do
case Electric.Config.get_env(:exclude_spans) do
nil -> false
set -> MapSet.member?(set, name)
end
end
defp sample? do
:rand.uniform() <= Electric.Config.get_env(:otel_sampling_ratio)
end
def sample_metrics? do
:rand.uniform() <= Electric.Config.get_env(:metrics_sampling_ratio)
end
end