Show environment variables in Heroku
I was looking for WEB_CONCURRENCY environment variable on my Django-app. This is used for the number of concurrent webworkers for gunicorn, and is automatically scaled depending on the memory usage of your app.
I can do it with the toolbelt, and the command
heroku run printenv --app your-app-name | grep WEB_CONCURRENCY
For environement variables that are set by us as a setting, the can also be found with:
heroku config --app your-app-name
Read more on optimizing your app here
Yes, Cows are obvious environment variables