prometheus returning no data from signald scrape job
ngix logs show: 4132 no live upstreams while connecting to upstream, client: REDACTED, server: signald.signalboost.info
suspected cause: metrics docker compose vhost.d ip whitelisting
works because we mount a volume from the filesystem instead of
using a named volume, but in signalboost prod configs we still
use a (vestigal) named volume from example configs
attemped fix: mount the vhost.d directory from the repo instead of using the
named volume
specify https scheme in prometheus_prod.yml configs
this fixes a longstanding unnoticed bug in which we shipped our
prometheus scrape job configs to use the default scheme (which is
http) instead of explicitly specifying https
