Integrando o AppSignal ao Phoenix

# mix.exs
defmodule AppsignalPhoenixExample.MixProject do
  # ...

  defp deps do
    [
      {:phoenix, "~> 1.5.3"},
      {:appsignal_phoenix, "~> 2.0"}
      # ...
    ]
  end
end

defmodule AppsignalPhoenixExampleWeb.RoomChannel do
  use Phoenix.Channel

  # ...

  def handle_in("new_msg", %{"body" => body} = params, socket) do
    Appsignal.Phoenix.Channel.instrument(__MODULE__, "new_msg", params, socket, fn ->
      broadcast!(socket, "new_msg", %{body: body})
      {:noreply, socket}
    end)
  end
end

defmodule SomeApp.MyChannel do
  use Appsignal.Instrumentation.Decorators

  @decorate channel_action()
  def handle_in("ping", _payload, socket) do
    # seu código aqui..
  end
end

defmodule AppsignalPhoenixExample.Application do
  # ...
  def start(_type, _args) do
    Appsignal.Phoenix.LiveView.attach() # <--- anexa os handlers do LiveView Telemetry
    children = [
      # Inicia o repositório Ecto
      AppsignalPhoenixExample.Repo,
      # Inicia o supervisor de Telemetry
      AppsignalPhoenixExampleWeb.Telemetry,
      # Inicia o sistema PubSub
      {Phoenix.PubSub, name: AppsignalPhoenixExample.PubSub},
      # Inicia o Endpoint (http/https)
      AppsignalPhoenixExampleWeb.Endpoint
      # Inicia um worker chamando: AppsignalPhoenixExample.Worker.start_link(arg)
      # {AppsignalPhoenixExample.Worker, arg}
    ]
    # Veja https://hexdocs.pm/elixir/Supervisor.html
    # para outras estratégias e opções suportadas
    opts = [strategy: :one_for_one, name: AppsignalPhoenixExample.Supervisor]
    Supervisor.start_link(children, opts)
  end
end

defmodule AppsignalPhoenixExampleWeb.ClockLive do
  use Phoenix.LiveView
  import Appsignal.Phoenix.LiveView, only: [instrument: 4]

  def render(assigns) do
    AppsignalPhoenixExampleWeb.ClockView.render("index.html", assigns)
  end

  def mount(_session, socket) do
    # Envolva o conteúdo da função mount/2 com uma chamada a
    # Appsignal.Phoenix.LiveView.instrument/4

    instrument(__MODULE__, "mount", socket, fn ->
      :timer.send_interval(1000, self(), :tick)
      {:ok, assign(socket, state: Time.utc_now())}
    end)
  end

  def handle_info(:tick, socket) do
    # Envolva o conteúdo da função handle_info/2 com uma chamada a
    # Appsignal.Phoenix.LiveView.instrument/4:

    instrument(__MODULE__, "tick", socket, fn ->
      {:ok, assign(socket, state: Time.utc_now())}
    end)
  end
end