Have you see whether Splunk logs when the limit is imposed and threads are killed, and if it does could you share where that is being logged? Thanks!
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See jonuwz's post on this page: http://answers.splunk.com/answers/4263/can-you-refresh-a-single-modulechart-without-refreshing-the-whole-dashboard?page=1&focusedAnswerId=4275#4275
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