setup-zipkin-random-open-telemetry

change-1-application.ex

defmodule ZipkinRandom.Application do
  # See https://hexdocs.pm/elixir/Application.html
  # for more information on OTP Applications
  @moduledoc false

  use Application

  def start(_type, _args) do
    # register your tracer so that opentelemtry knows that 
    # it needs to start tracing the events
    _ = OpenTelemetry.register_application_tracer(:zipkin_random)

    children = [
      # Starts a worker by calling: ZipkinRandom.Worker.start_link(arg)
      # {ZipkinRandom.Worker, arg}
    ]

   ...
  end
end

change-1-config.exs

import Config

config :opentelemetry,
       :processors,
       ot_batch_processor: %{
         exporter:
           {:opentelemetry_zipkin,
            %{
              address: 'http://localhost:9411/api/v2/spans',
              local_endpoint: %{service_name: "zipkin_random"}
            }}
       }

change-1-mix.exs

defmodule ZipkinRandom.MixProject do
  use Mix.Project

  ...

  # Run "mix help deps" to learn about dependencies.
  defp deps do
    [
      {:opentelemetry_api, "~> 0.3.2"},
      {:opentelemetry_zipkin, "~> 0.2.0"},
      {:opentelemetry, "~> 0.4.0"}
      # {:dep_from_hexpm, "~> 0.3.0"},
      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
    ]
  end
  ...
end

change-1-zipkin_random.ex

defmodule ZipkinRandom do
  @moduledoc """
  Documentation for `ZipkinRandom`.
  """

  require OpenTelemetry.Tracer

  @doc """
  Hello world.

  ## Examples

      iex> ZipkinRandom.hello()
      :world

  """
  def hello do
    # Here we are starting our new span
    OpenTelemetry.Tracer.start_span("span_name_1")

    # Mimic that some work is happening
    Process.sleep(100)
    # finish the span just before returning the response
    OpenTelemetry.Tracer.end_span()
    :world
  end
end

Hey! Great article, thanks for that!
Could ot_batch_processor have a typo? I have found only otel_batch_processor in the repo

Nevermind, I see now it was renamed in the newer version