AppSignal's Plug instrumentation instruments calls to Plug applications to gain performance insights and error reporting.

To install Appsignal.Plug into your Plug application, first add :appsignal_plug to your project's dependencies:

defp deps do
  {:appsignal_plug, "~> 2.0"}
end

After that, follow the installation instructions for Appsignal for Elixir.

Finally, use Appsignal.Plug in your application's router module:

defmodule AppsignalPlugExample do
  use Plug.Router
  use Appsignal.Plug

  plug(:match)
  plug(:dispatch)

  get "/" do
    send_resp(conn, 200, "Welcome")
  end
end

For more information, check out the Integrating AppSignal into Plug guide.