> ## 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.

# Heroku Deploy Markers

> Learn how to set up deploy markers for Heroku dyno's for AppSignal using Heroku's logplex system.

A deploy marker indicates a change in the deployed version of an application. This can be used to group together occurrences of errors and performance issues within a certain time frame. From when the version was deployed until a newer version was deployed. Deploy markers are also required to enable [backtrace links](/application/backtrace-links) for an app.

We normally recommend using the [`revision` config option](/application/markers/deploy-markers) to set the correct revision for a deploy.

## Cedar (Legacy Platform) applications

<Note>
  Make sure a working [Heroku Logplex Log Drain](/heroku/setup) is setup before continuing with this section.
</Note>

Using Heroku with the [Heroku Labs: Dyno Metadata](https://devcenter.heroku.com/articles/dyno-metadata) enabled will automatically set the `revision` config option to the `HEROKU_SLUG_COMMIT` system environment variable. This will automatically report new deploys when the Heroku app gets deployed.

<Note>
  📖 Read our guide on [how to set up deploy markers](/guides/deploy-markers).
</Note>

To enable Dyno metadata run:

```bash Bash theme={null}
heroku labs:enable runtime-dyno-metadata -a <app_name>
```

replacing `<app_name>` with your app name. And that's it! Deploys will now automatically be tracked by AppSignal.

## Fir applications

Currently, deploy markers aren't available for Heroku Fir generation applications.