It seems the tool 'prometheus' is currently unused.
I couldn't find a task to create it and/or any place that seems to depend on it.
Proposing it be removed for the sake of avoiding it getting confused with any other Prometheus-related infrastructure.
tools.prometheus@tools-bastion-03:~$ tree . ├── logs └── replica.my.cnf 1 directory, 1 file tools.prometheus@tools-bastion-03:~$ webservice status Your webservice is not running tools.prometheus@tools-bastion-03:~$ qstat tools.prometheus@tools-bastion-03:~$ $ curl -s -I -X GET https://tools.wmflabs.org/prometheus | grep HTTP HTTP/1.1 404 Not Found
CC @yuvipanda