A TimeInterval, read-create, defining how long the agent waits before re-sending an identical notification if the monitored signal keeps oscillating around the threshold. It exists specifically to stop a flapping signal from flooding the management station with repeated near-duplicate traps. For example, setting cwrThreshHysteresisTime to 300 seconds means that even if a marginal signal crosses the threshold five times in a minute, the admin receives at most one notification every five minutes during the flapping.