Telemetry.Poller

Allows to periodically collect measurements and dispatch them as Telemetry events.

Telemetry.Poller ships with a default poller for VM measurements:

config :telemetry_poller, :default,
  vm_measurements: :default # or a list such as [:memory, ...]

Poller also provides a convenient API for specifying functions called periodically to dispatch measurements as Telemetry events:

# define custom function dispatching event with value you're interested in
defmodule ExampleApp.Measurements do
  def dispatch_session_count() do
    :telemetry.execute([:example_app, :session_count], ExampleApp.session_count())
  end
end

Telemetry.Poller.start_link(
  # include custom measurement
  measurements: [
    {ExampleApp.Measurements, :dispatch_session_count, []}
  ],
  period: 10_000 # configure sampling period
)

See documentation for more concrete examples and usage instructions.

Copyright and License

Copyright (c) 2018, Chris McCord and Erlang Solutions.

Telemetry source code is licensed under the Apache License, Version 2.0.