The jockey pump is controlled by a separate controller from the main fire pump. Many times, the jockey control box is a separate control box, and is not monitored by the fire alarm system because the jockey pump isn't needed for fire suppression. The only purpose of the jockey pump is to keep the pressure in the sprinkler system high enough that the main fire pump will not turn on.
If the pressure indicator that you're looking at is showing the actual pressure of the sprinkler system, then there might be a water leak. The leak could be in a drain valve (I've seen that problem a couple of times), it could be in the backflow prevention valve, it could be in the bearings for the main fire pump, it could be somewhere else in the building. Leaks are one problem to check.
If the pressure isn't actually fluctuating, the problem could be in the jockey pump controller.
Either way, the problems should be looked at by someone from a sprinkler company.
Douglas Krantz
