# 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())

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

See [documentation]( for more concrete examples and usage

## Copyright and License

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

Telemetry source code is licensed under the [Apache License, Version 2.0](LICENSE).