## Added

- Automatically detect the application's revision from the `HEROKU_BUILD_COMMIT`
  environment variable, which is set by Heroku at build time [when the
  `runtime-dyno-build-metadata` Heroku Labs
  feature](https://devcenter.heroku.com/articles/dyno-metadata) is enabled.

## Fixed

- Improve handling of the extension internal queue when full.
- Fix issues in the extension that lead to gaps in data reporting.
- Fix an extension crash when the same span is used from multiple threads at the same time.