* Update documentation for running with Prometheus There's two environment variables that need to be set in order to use Prometheus and the /metrics endpoint. * Missing s * Update doc/self-hosting.md Co-authored-by: Caleb Cartwright <calebcartwright@users.noreply.github.com> Co-authored-by: Caleb Cartwright <calebcartwright@users.noreply.github.com> Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>