Provide metrics on root URL

lib/kafkaex_lag_exporter_web.ex

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+defmodule KafkaexLagExporterWeb do
+  @moduledoc """
+  The entrypoint for defining your web interface, such
+  as controllers, views, channels and so on.
+
+  This can be used in your application as:
+
+      use KafkaexLagExporterWeb, :controller
+      use KafkaexLagExporterWeb, :view
+
+  The definitions below will be executed for every view,
+  controller, etc, so keep them short and clean, focused
+  on imports, uses and aliases.
+
+  Do NOT define functions inside the quoted expressions
+  below. Instead, define any helper function in modules
+  and import those modules here.
+  """
+
+  def controller do
+    quote do
+      use Phoenix.Controller, namespace: KafkaexLagExporterWeb
+
+      import Plug.Conn
+      alias KafkaexLagExporterWeb.Router.Helpers, as: Routes
+    end
+  end
+
+  def view do
+    quote do
+      use Phoenix.View,
+        root: "lib/kafkaex_lag_exporter_web/templates",
+        namespace: KafkaexLagExporterWeb
+
+      # Import convenience functions from controllers
+      import Phoenix.Controller,
+        only: [get_flash: 1, get_flash: 2, view_module: 1, view_template: 1]
+
+      # Include shared imports and aliases for views
+      unquote(view_helpers())
+    end
+  end
+
+  def router do
+    quote do
+      use Phoenix.Router
+
+      import Plug.Conn
+      import Phoenix.Controller
+    end
+  end
+
+  def channel do
+    quote do
+      use Phoenix.Channel
+    end
+  end
+
+  defp view_helpers do
+    quote do
+      # Import basic rendering functionality (render, render_layout, etc)
+      import Phoenix.View
+
+      import KafkaexLagExporterWeb.ErrorHelpers
+      alias KafkaexLagExporterWeb.Router.Helpers, as: Routes
+    end
+  end
+
+  @doc """
+  When used, dispatch to the appropriate controller/view/etc.
+  """
+  defmacro __using__(which) when is_atom(which) do
+    apply(__MODULE__, which, [])
+  end
+end