This is the dampening interval for the rising threshold defined in this policy entry -- the window during which fluctuating usage near the threshold will not generate repeated notifications -- and it defaults to zero, no dampening, if never explicitly configured. A zero value here specifically means every single crossing of the rising threshold, however brief, generates an immediate notification, which can produce alert storms on a resource pool that oscillates right around its threshold. A policy left with this interval at the default zero on a CPU threshold that hovers right at the boundary during normal traffic bursts would generate a fresh up notification every time usage ticks over, rather than only once per sustained excursion.