# 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 ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://ciusji.gitbook.io/leona/getting-in/log-sources/ingest-logs-manually/application-data.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.