Django: CONN_MAX_AGE persists connections, but doesn't reuse them with PostgreSQL
Solution 1:
Doing some more experimenting, I have found that the cause of our problem was indeed gunicorn's eventlet worker class. Each microthread made it's own persistent connection, and there was no way at all to reuse any of them.
Disabling eventlet has made the load on our webservers go up (but not by much), but the postgres load is now down to an average of 3. From 30.