> For the complete documentation index, see [llms.txt](https://ciusji.gitbook.io/leona/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ciusji.gitbook.io/leona/getting-in/log-sources/ingest-logs-manually/application-data.md).

# Application Data

We could not cover all languages or examples for many applications in the documentation. But to give a brief overview, we created this page.

## **Heroku**

You need to apply a workaround if you want custom logging on Heroku. The reason for this is that Heroku injects its own logger (`rails_log_stdout`), that overwrites your custom one. The workaround is to add a file that makes Heroku think that the logger is already in your application:

```
touch vendor/plugins/rails_log_stdout/heroku_fix
```