Final answer:
An ongoing current problem is usually indicated by an Alarm, which is an immediate signal that something requires attention in the IT infrastructure.
Step-by-step explanation:
An indication of an ongoing current problem in network management systems or IT infrastructure is typically represented by an Alarm. An alarm is a clear and immediate signal that something is not functioning as expected, and it often requires prompt attention to resolve the issue. Unlike an alarm, an alert might not indicate an immediate problem but rather a notification for the user to check something, a trend can indicate the general direction of data over time, and a trap is a message sent from an agent to a network management station to signal an event.