We stop short of rewriting all playbooks for Prometheus, and instead
add references to the task of adding playbooks for
everything (prometheus-alerts#16) where we found references to
nagios.

service/forum.md

@@ -393,7 +393,7 @@ which are lavamind, hiro, gus and duncan.
 
 ## Monitoring and testing
 
-Only general Nagios/Prometheus monitoring is in place on the instance, there is
+Only general monitoring is in place on the instance, there is
 no Discourse-specific monitoring in place.
 
 ## Logs and metrics