Revert "Revert breaking prometheus changes to gunicorn_conf.py"
Revert "Revert breaking prometheus changes to gunicorn_conf.py"

This reverts commit e593873f04fd794116a7d7218b2d121828526808.

dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq