Mira has had a failed nic, and as the nic is onboard to the mainboard, it is a failing mainboard. The system is out of warranty, and has been replaced fully by naos in T162900.
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This checklist, copied from server lifecycle page:
[x] - all system services confirmed offline from production use
[x] - set all icinga checks to maint mode/disabled while reclaim/decommmission takes place.
[x] - remove system from all lvs/pybal active configuration - https://gerrit.wikimedia.org/r/#/c/353116/
[x] - any service group puppet/heira/dsh config removed - https://gerrit.wikimedia.org/r/#/c/353116/
[] - remove site.pp (replace with role::spare if system isn't shut down immediately during this process.) - system will be SHUTDOWN immediately @robh submitting the patchset) - https://gerrit.wikimedia.org/r/#/c/353116/
START NON-INTERRUPPTABLE STEPS
[] - disable puppet on host
[] - remove all remaining puppet references (include role::spare) - https://gerrit.wikimedia.org/r/#/c/353116/
[] - power down host
[] - disable switch port
[] - switch port assignment noted on this task (for later removal)
[] - remove production dns entries
[] - 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.