scope log: false do
  get "/pages/:id", PageController, :show
end

or

get "/pages/:id", PageController, :show, log: false

I use this plug:

defmodule HelloWeb.Plug.HealthCheck do
  import Plug.Conn

  def init(opts), do: opts

  def call(%Plug.Conn{request_path: "/healthy"} = conn, _opts) do
    conn
    |> send_resp(200, "")
    |> halt()
  end

  def call(conn, _opts), do: conn
end

And then endpoint.ex uses it like this plug(HelloWeb.Plug.HealthCheck) as the first thing that gets defined. This way it does the least amount of work possible. No controller or route needed and your normal pipeline gets ignored.

Pretty sure I grabbed that snippet and slightly modified it from one of @jola’s blog posts.

For anyone that stumbles across this question in the future, I wrote a library to do this exact thing but with any plug GitHub - akoutmos/unplug: Unplug allows you to conditionally execute your Elixir plugs at run-time · GitHub

Using Unplug, you can provide a predicate module that gets evaluated under the context of the current plug, and you can specify whether you want the attached plug to be executed or not.