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APM 9 Performance - Number of metric data queries per interval

Question asked by jankei on Mar 22, 2011
Latest reply on Mar 25, 2011 by jankei
We have an APM 9 architecture with one MOM and four EM servers on five dedicated Red Hat Enterprise Linux machines. If the CPU/RAM/JVM parameters matter please ask. Sometimes we notice a behaviour that the "Overall capacity (%)" metric of one EM rises over the warning or the caution level and the metric "Number of metric data queries per interval" has a peak. Therefore the whole measuring interval last over 15 seconds so that we don´t get any data.
What are "metric data queries per interval"? Are they triggered by a user or a system activity?