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8da2481 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | defmodule Plausible.OpenTelemetry.Logger do
@moduledoc """
Telemetry handler that adds the OpenTelemetry trace_id to Logger metadata.
This enables correlation between log lines and distributed traces.
The trace_id is extracted from the current OTel span context and added
to the Logger metadata when Phoenix router dispatch starts.
"""
@doc """
Attaches telemetry handlers to set trace_id in Logger metadata.
Should be called during application startup, after OpentelemetryPhoenix.setup().
"""
def setup do
:telemetry.attach(
"plausible-otel-logger-metadata",
[:phoenix, :router_dispatch, :start],
&__MODULE__.handle_router_dispatch_start/4,
%{}
)
end
@doc false
def handle_router_dispatch_start(_event, _measurements, _metadata, _config) do
case Plausible.OpenTelemetry.current_trace_id() do
nil ->
:ok
trace_id_hex ->
Logger.metadata(trace_id: trace_id_hex)
end
end
end
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