There's a section about finding information in Nagios which I don't know
how to translate to prometheus, so I left it there, but we'll want to
remove and/or review that.

service/prometheus.md

@@ -1948,49 +1948,6 @@ exporter configuration. Look in `tor-puppet.git`, the
 `hiera/common/prometheus.yaml`, where credentials should be defined
 (although they should actually be stored in Trocla).
 
-### Host reported as unreachable
-
-Servers that stop responding can have multiple different causes. To bring it
-back online as soon as possible, we need to identify what's preventing it from
-responding and then to address that problem.
-
-#### Node exporter stopped or crashed
-
-See the section about [Job Down errors](#exporter-job-down-warnings)
-
-#### Can't connect with SSH
-
-This situation can be caused by:
-
-1. a network outage at our provider
-2. RAM and swap being full
-3. the host being offline
-
-If the host in question is a VM in our clusters try to reach the ganeti node
-containing the instance. From there you can use the [serial
-console](howto/ganeti#accessing-serial-console) to identify what's happening
-with the instance.
-
-If the host is _not_ an instance in our ganeti clusters, then reach out for the
-console at the corresponding provider's site.
-
-If the machine is running but the network is unreachable, check with our
-hosting provider if any known network issues are currently known and if not open
-a support ticket with them.
-
-If the machine is running but you have difficulty even logging into the TTY, try
-and figure out what's happening like if you can see messages on the console
-about processes getting OOM-Killed, disk failures, kernel panics or other
-critical problems.
-
-Once you have some information, if the errors you see are not related to disk
-failures you'll want to forcefully restart the machine, either with ganeti if
-it's an instance or with the help of the hosting provider's website or support.
-
-If the errors are related to disk failures, you'll want to enlist the help of
-our hosting providers to get a disk replacement and fix any RAID arrays that are
-now degraded.
-
 ### Apache exporter scraping failed
 
 If you get the error `Apache Exporter cannot monitor web server on