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New Relic's Open-Source Elixir Agent

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new_relic_agent lib new_relic sampler agent.ex
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lib/new_relic/sampler/agent.ex 

defmodule NewRelic.Sampler.Agent do

  use GenServer



  # Takes samples of the state of the Agent



  @moduledoc false



  def start_link(_) do

    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)

  end



  def init(:ok) do

    if NewRelic.Config.enabled?(),

      do: Process.send_after(self(), :report, NewRelic.Sampler.Reporter.random_sample_offset())



    {:ok, %{}}

  end



  def handle_info(:report, state) do

    record_sample()

    Process.send_after(self(), :report, NewRelic.Sampler.Reporter.sample_cycle())

    {:noreply, state}

  end



  def handle_call(:report, _from, state) do

    record_sample()

    {:reply, :ok, state}

  end



  def record_sample do

    NewRelic.report_metric(

      {:supportability, :agent, "Sidecar/ActiveCount"},

      value: NewRelic.Transaction.Sidecar.counter()

    )



    NewRelic.report_metric(

      {:supportability, :agent, "ErlangTrace/Restarts"},

      value: NewRelic.Transaction.ErlangTraceManager.restart_count()

    )

  end

end