This checklist is able to be copied and pasted into phabricator hardware request tasks for reclaiming systems to spare or decom. 
[] - all system services confirmed offline from production use 
[] - set all icinga checks to maint mode/disabled while reclaim/decommmission takes place. 
[] - remove system from all lvs/pybal active configuration 
[] - any service group puppet/hiera/dsh config removed 
[] - remove site.pp (replace with role(spare::system) if system isn't shut down immediately during this process.) 
START NON-INTERRUPPTABLE STEPS 
[] - disable puppet on host 
[] - power down host 
[] - disable switch port 
[] - switch port assignment noted on this task (for later removal)
[] - remove all remaining puppet references (include role::spare) 
[] - remove production dns entries 
[] - puppet node clean, puppet node deactivate 
[] - remove dbmonitor entries on neodymium/sarin: sudo curl -X DELETE https://debmonitor.discovery.wmnet/hosts/${HOST_FQDN} --cert /etc/debmonitor/ssl/cert.pem --key /etc/debmonitor/ssl/server.key
END NON-INTERRUPPTABLE STEPS 
[] - system disks wiped (by onsite) 
[] - IF DECOM: system unracked and decommissioned (by onsite), update racktables with result 
[] - IF DECOM: switch port configration removed from switch once system is unracked. 
[] - IF DECOM: add system to decommission tracking google sheet
[] - IF DECOM: mgmt dns entries removed. 
[] - IF RECLAIM: system added back to spares tracking (by onsite)