Thread Leak AnalyticEngine

Hi

One of the built in rules is defined as

(AnalyticEngine/Thread Count by Analytic Engine/Reading_Value) > (250) with the rule name

In our production environment this rule is constantly triggered. We seem
to be running on about 375 threads on average.

Before we go ahead and change the reading I would like to ask if this is abnormally high and if so what should I check?