opentelemetry-initializers.rb

unless Rails.env.test?
  # SAMPLING_RATE = 0.10

  OpenTelemetry::SDK.configure do |c|
    c.service_name = ENV.fetch('CLUSTER_NAME', "project-#{Rails.env}")

    c.id_generator = OpenTelemetry::Propagator::XRay::IDGenerator
    # The X-Ray Propagator injects the X-Ray Tracing Header into downstream calls
    c.propagators = [OpenTelemetry::Propagator::XRay::TextMapPropagator.new]

    # we want calls that go into the AWS SDK to be terminal requests without tracing underlying
    # HTTP calls and other things which would make the trace noise-y.
    c.use 'OpenTelemetry::Instrumentation::AwsSdk', {
      suppress_internal_instrumentation: true,
    }

    c.use 'OpenTelemetry::Instrumentation::Rails'
    c.use 'OpenTelemetry::Instrumentation::Rack'
    c.use 'OpenTelemetry::Instrumentation::ActionPack'
    c.use 'OpenTelemetry::Instrumentation::ActiveSupport'
    c.use 'OpenTelemetry::Instrumentation::ActionView'
    c.use 'OpenTelemetry::Instrumentation::ActiveRecord'

    c.use 'OpenTelemetry::Instrumentation::Faraday'
    c.use 'OpenTelemetry::Instrumentation::PG'
    c.use 'OpenTelemetry::Instrumentation::Redis'
    c.use 'OpenTelemetry::Instrumentation::Sidekiq'
    c.use 'OpenTelemetry::Instrumentation::Net::HTTP'

    # c.add_span_processor(
    #   OpenTelemetry::SDK::Trace::Export::BatchSpanProcessor.new(
    #     # Arguments for exporter:
    #     # https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md
    #     OpenTelemetry::Exporter::OTLP::Exporter.new,
    #   ),
    # )

    # Alternatively, we could just enable all instrumentation:
    # c.use_all({ 'OpenTelemetry::Instrumentation::ActiveRecord' => { enabled: false } })
  end

  # OpenTelemetry.tracer_provider.sampler = OpenTelemetry::SDK::Trace::Samplers.parent_based(root: OpenTelemetry::SDK::Trace::Samplers.trace_id_ratio_based(SAMPLING_RATE))
end