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spawn

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Spawn is the core lib for Spawn Actors System

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spawn lib sidecar metrics_supervisor.ex
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lib/sidecar/metrics_supervisor.ex 

defmodule Sidecar.MetricsSupervisor do

  @moduledoc false

  use Supervisor

  import Telemetry.Metrics



  def start_link(config) do

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

  end



  def init(config) do

    children =

      if metrics_disabled? do

        []

      else

        [

          {:telemetry_poller, measurements: periodic_measurements(config)},

          {TelemetryMetricsPrometheus.Core, name: :spawm_metrics, metrics: metrics()},

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

        ]

      end



    Supervisor.init(children, strategy: :one_for_one)

  end



  defp metrics do

    [

      # VM Metrics

      last_value("vm.system_info.process_count"),

      last_value("vm.system_info.schedulers"),

      last_value("vm.system_info.schedulers_online"),

      last_value("vm.system_info.dirty_cpu_schedulers"),

      last_value("vm.system_info.dirty_cpu_schedulers_online"),

      last_value("vm.system_info.thread_pool_size"),

      last_value("vm.system_info.dist_buf_busy_limit", unit: :byte),

      last_value("vm.memory.total", unit: :byte),

      last_value("vm.total_run_queue_lengths.total"),

      last_value("vm.total_run_queue_lengths.cpu"),

      last_value("vm.total_run_queue_lengths.io"),



      # Actor Metrics

      last_value("spawn.actor.memory", unit: :byte),

      last_value("spawn.actor.message_queue_len"),

      last_value("spawn.actor.inflight_messages.messages"),

      counter("spawn.invoke.stop.duration"),

      summary("spawn.invoke.stop.duration", unit: {:native, :millisecond})

    ]

  end



  defp periodic_measurements(config) do

    [

      {:process_info,

       event: [:spawn, :actor], name: Actors.Actor.Entity, keys: [:message_queue_len, :memory]},

      {Sidecar.Measurements, :stats, [config]}

    ]

  end



  # TODO: Add this env var to Config

  defp metrics_disabled?, do: System.get_env("SPAWN_DISABLE_METRICS", "false") !== "false"

end