> ## Documentation Index
> Fetch the complete documentation index at: https://docs.appsignal.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Erlang

The AppSignal for Elixir package integrates with the Erlang VM to provide metrics not just about your app but the virtual machine it's running in.

## Minutely probe

Since AppSignal Elixir package `1.10.1` and up a [minutely probe](/elixir/instrumentation/minutely-probes) is activated by default. Once we detect these metrics we'll add a [magic dashboard](https://blog.appsignal.com/2019/03/27/magic-dashboards.html) to your apps.

This probe will report the following [metrics](/metrics/custom) grouped by `hostname` tag:

* `erlang_io` - gauge
  * Tag `type`:
    * `input`
    * `output`
* `erlang_schedulers` - gauge
  * Tag `type`:
    * `total`
    * `online`
* `erlang_processes` - gauge
  * Tag `type`:
    * `limit`
    * `count`
* `erlang_memory` - gauge
  * Tag `type`:
    * `total`
    * `processes`
    * `processes_used`
    * `system`
    * `atom`
    * `atom_used`
    * `binary`
    * `code`
    * `ets`
* `erlang_atoms` - gauge
  * Tag `type`:
    * `limit`
    * `count`
* `erlang_scheduler_utilization` - gauge (since version `2.2.8`)
  * Tag `type`:
    * `normal`
  * Tag `id`: the ID of the scheduler

### Configuration

This probe listens to the [`hostname` config option](/elixir/configuration/options#option-hostname) for the hostname tag added to all its metrics. If none is set it will try to detect it automatically. Use the `hostname` config option to set the hostname if you want to change the detected hostname.