Events are what the agent and the hub already decided was worth recording. They feed alerts and the nightly BE AI pass.
The name menu and Apply keep one kind — Show only one kind of event. disk_high, check_failed, check_recovered, rebooted, wifi_degraded, external_ip_changed are the usual ones. ai_autorun_held is why BE AI did not fire again on the same open alert. One machine's own list is Read one machine's events. An address line is See when the external address changed.