change-3-zipkin_random

change-3-zipkin_ranom.ex

  ...
  def second_event(delay) do
    OpenTelemetry.Tracer.start_span("second_event_span")
    # again mimicing the same stuff
    Process.sleep(delay)

    # use set_attributes api to add the attributes during the span
    OpenTelemetry.Span.set_attributes([{"delay_data", delay}])
    OpenTelemetry.Tracer.end_span()

    "world slept for #{delay}ms"
  end
  ...