Defines the modules that declare application metrics for OtelBridge.

A spec module declares metrics in plain Telemetry.Metrics terms while leaving OpenTelemetry runtime concerns to OtelBridge.

A minimal example

defmodule MyApp.Metrics do
  use OtelBridge.Spec

  @impl OtelBridge.Spec
  def metrics(meta) do
    [
      summary("my_app.request.duration",
        event_name: [:my_app, :request, :stop],
        measurement: :duration,
        unit: {:native, :millisecond},
        tags: [:route],
        tag_values: fn metadata ->
          Map.put(metadata, :route, Keyword.get(meta, :default_route, "unknown"))
        end
      )
    ]
  end
end

Pass modules like this to OtelBridge through the :specs option.

About meta

The meta argument is provided by the :meta option passed to OtelBridge. Use it for values that should be shared across metric definitions, such as:

• service name
• environment name
• static tags
• reusable defaults