Conductor UI throws an alarm with message Fib capacity exceeded: 95%.

One of the reasons for fib entry filling up too fast could be a sudden route leak from other routing protocols like BGP. 
In such scenarios, the alarm can last only few seconds. Highway logs will provide more info about these sudden bursts of routes learned hrough bgp or other protocol which would result into multiple entries in fib.

Aug 22 04:34:03.529 [RTG |RFIB] INFO (routingAgPoller) Received end of fib: version=2, msg_type=3, msg_len=5, body:

Bgp

Aug 22 04:34:03.529 [RTG |RFIB] INFO (routingAgPoller) End of fib action FORWARD (0)

Aug 22 04:34:03.529 [RTG |RFIB] INFO (routingAgPoller) Resetting end of fib deltas at 680 adds, 17 modifications and 0 deletes

In this case, routes eventually were deleted by another bgp update 30s later. Suggestion is to review the bgp neighbors as to why there was a bulk route update all of a sudden in the network.