defmodule SyntropyWeb.MetricsController do
  use SyntropyWeb, :controller

  @doc """
  Prometheus scrape endpoint (text exposition format).
  """
  @spec index(Plug.Conn.t(), map()) :: Plug.Conn.t()
  def index(conn, _params) do
    conn
    |> put_resp_content_type("text/plain")
    |> send_resp(200, SyntropyWeb.Telemetry.scrape())
  end
end