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# Link releases

Python, Ruby, and PHP apps run their source code directly, so there are no source maps to upload. Stack traces already show the right files and lines.

To link each exception to the [release](/docs/error-tracking/releases.md) that produced it, create the release when you deploy and give its ID to your app. The SDK reads the ID from the `POSTHOG_RELEASE_ID` environment variable and sends it as `$release_id` on every event.

## Platforms

-   [![](https://res.cloudinary.com/dmukukwp6/image/upload/posthog.com/contents/images/docs/integrate/python.svg)Python](/docs/error-tracking/link-releases/python.md)

-   [![](https://res.cloudinary.com/dmukukwp6/image/upload/posthog.com/contents/images/docs/integrate/ruby.svg)Ruby](/docs/error-tracking/link-releases/ruby.md)

-   [![](https://res.cloudinary.com/dmukukwp6/image/upload/posthog.com/contents/images/docs/integrate/php.svg)PHP](/docs/error-tracking/link-releases/php.md)

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