Datadog APM instrumentation to have SQL Time for every event

datadog_apm_sql_time.rb

ActiveSupport::Notifications.subscribe('process_action.action_controller') do |*args|
  event   = ActiveSupport::Notifications::Event.new(*args)
  span    = Datadog.tracer.active_span
  payload = event.payload

  if span && payload.key?(:db_runtime)
    db_runtime = payload[:db_runtime].to_f.round(3)
    span.set_tag('database.sql_time', db_runtime)
  end
end

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