iridium was phabricator, has been replaced by phab1001.
after a grace period, start decom'ing with all the steps.. not yet though
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[] - 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/heira/dsh config removed
[] - remove site.pp (replace with role::spare if system isn't shut down immediately during this process.)
START NON-INTERRUPPTABLE STEPS
[] - disable puppet on host
[] - remove all remaining puppet references (include role::spare) https://gerrit.wikimedia.org/r/#/c/366877/
[] - power down host
[] - disable switch port
[] - switch port assignment noted on this task (for later removal) asw-b-eqiad:ge-1/0/16
[] - remove production dns entries https://gerrit.wikimedia.org/r/#/c/366878/
[] - puppet node clean, puppet node deactivate, salt key removed
END NON-INTERRUPPTABLE STEPS
[] - system disks wiped (by onsite)
[] - system unracked and decommissioned (by onsite), update racktables with result
[] - switch port configration removed from switch once system is unracked.
[] - mgmt dns entries removed.