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phx_new

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Phoenix framework project generator. Provides a `mix phx.new` task to bootstrap a new Elixir application with Phoenix dependencies.

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phx_new templates phx_web telemetry.ex
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templates/phx_web/telemetry.ex 

defmodule <%= web_namespace %>.Telemetry do

  use Supervisor

  import Telemetry.Metrics



  def start_link(arg) do

    Supervisor.start_link(__MODULE__, arg, name: __MODULE__)

  end



  @impl true

  def init(_arg) do

    children = [

      # Telemetry poller will execute the given period measurements

      # every 10_000ms. Learn more here: https://hexdocs.pm/telemetry_metrics

      {:telemetry_poller, measurements: periodic_measurements(), period: 10_000}

      # Add reporters as children of your supervision tree.

      # {Telemetry.Metrics.ConsoleReporter, metrics: metrics()}

    ]



    Supervisor.init(children, strategy: :one_for_one)

  end



  def metrics do

    [

      # Phoenix Metrics

      summary("phoenix.endpoint.stop.duration",

        unit: {:native, :millisecond}

      ),

      summary("phoenix.router_dispatch.stop.duration",

        tags: [:route],

        unit: {:native, :millisecond}

      ),<%= if ecto do %>



      # Database Metrics

      summary("<%= app_name %>.repo.query.total_time", unit: {:native, :millisecond}),

      summary("<%= app_name %>.repo.query.decode_time", unit: {:native, :millisecond}),

      summary("<%= app_name %>.repo.query.query_time", unit: {:native, :millisecond}),

      summary("<%= app_name %>.repo.query.queue_time", unit: {:native, :millisecond}),

      summary("<%= app_name %>.repo.query.idle_time", unit: {:native, :millisecond}),<% end %>



      # VM Metrics

      summary("vm.memory.total", unit: {:byte, :kilobyte}),

      summary("vm.total_run_queue_lengths.total"),

      summary("vm.total_run_queue_lengths.cpu"),

      summary("vm.total_run_queue_lengths.io")

    ]

  end



  defp periodic_measurements do

    [

      # A module, function and arguments to be invoked periodically.

      # This function must call :telemetry.execute/3 and a metric must be added above.

      # {<%= web_namespace %>, :count_users, []}

    ]

  end

end