Ruby Manual Instrumentation
Datadog's Research Report: The State of Serverless Report: The State of Serverless

Ruby Manual Instrumentation

If you aren’t using supported library instrumentation (see library compatibility), you may want to to manually instrument your code. Adding tracing to your code is easy using the Datadog.tracer.trace method, which you can wrap around any Ruby code:

# An example of a Sinatra endpoint,
# with Datadog tracing around the request,
# database query, and rendering steps.
get '/posts' do
  Datadog.tracer.trace('web.request', service: '<SERVICE_NAME>', resource: 'GET /posts') do |span|
    # Trace the activerecord call
    Datadog.tracer.trace('posts.fetch') do
      @posts = Posts.order(created_at: :desc).limit(10)

    # Add some APM tags
    span.set_tag('http.method', request.request_method)
    span.set_tag('posts.count', @posts.length)

    # Trace the template rendering
    Datadog.tracer.trace('template.render') do
      erb :index

For more details about manual instrumentation, check out the API documentation.

Further Reading