The mongod process is the Mongo database used for the correlation engine, if I remember correctly. How long has it been using high CPU time? Did it happen after a reboot?
@BenjAudy.MTL is correct. It would probably be advised to request support form TAC in this type of situation where you have already pin-pointed the cause of the CPU spike. If you have just restarted the device then seeing a slightly higher mongod utilization wouldn't be out of the ordinary
Potentially you may be able to fix it by issuing a debug software restart process device-server and a debug software restart process management-server. Since this doesn't effect the dataplane your traffic will still be forwarded and users shouldn't notice a difference. I'm not positive this would actually restart mongod though, so if this doesn't work I would try scheduling a restart of the whole device.
It could be corrupt, which would explain why it's running so high since it would be trying to process something that it cann't. I would contact TAC and see what they can do for you.
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