Port popovers let you inspect the data and events flowing through individual ports. A port popover pops up when you click on a port. If you want to keep the port popover open for a while, for example to look at several port popovers at once, click on the popover. While the composition is running, the port popover shows several pieces of information that can help with debugging:
Last event — The time of the most recent event through the port, and the average number of events per second.
Value — For ports that carry data, the most recent data through the port.
Event throttling — For trigger ports, whether the port enqueues or drops events.