View source for ReleaseEngineering/How To/Decommission Slave

There are a few steps that need to be followed here in order to decommission a slave.

* Disable the slave in Slavealloc: https://secure.pub.build.mozilla.org/slavealloc/ui/#slaves
* Make sure it's no longer attached to a master
* Shut down the slave 
* Remove it from Nagios 
** From puppet sysadmin repository (modules/nagios4/manifests/prod/releng/scl3.pp)
* Remove it from Inventory 
** DCOps must mark these machines as decommissioned
* Remove it from buildbot-configs 
** mozilla-tests/production_config.py  or mozilla/production_config.py
* Finally, remove that slave from buildslaves DB