Changes to dyno metadata config vars

Change effective on 14 May 2024

We added two new config vars to the beta Heroku Lab: Dyno Metadata feature: HEROKU_BUILD_COMMIT and HEROKU_BUILD_DESCRIPTION. These config vars are replacing the existing HEROKU_SLUG_COMMIT and HEROKU_SLUG_DESCRIPTION variables, which we’ll deprecate on June 15, 2024.

To see the new config vars, you must enable an extra flag, runtime-dyno-build-metadata, on top of the existing runtime-dyno-metadata flag:

heroku labs:enable runtime-dyno-build-metadata -a <app name>

For more info, see Heroku Lab: Dyno Metadata.