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Tech tip: jvm_monitor does not send QOS_DEFINITION for QOS_JVM_THREADCOUNT
Oct 18, 2018 11:38 AM
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I have activated the
QOS in jvm_monitoring but data is not coming into the database. Looking at DrNimbus I found out that probe does not send QOS_DEFINITON for this specific metric with the QOS Deinition messages for QOS_JVM_THREADCOUNT.
However, the monitor
sends that data correctly with QOS_MESSAGES. For this Reason data for the specific QOS is not available.
This is a known issue for the
For QOS_MESSAGE messages to be stored to the database a previous bus message with the QOS_DEFINITION for the same metric type must be received by the data_engine.
For some reason, the specific monitor JVM> java.lang > Threading > Name >
(QOS_JVM_THREADCOUNT) does not send the definition on probe start or after saving the monitor. The probe though sends the QOS_DEFINITION for QOS_JVM_THREADCOUNT if activated on different monitors within the same resource.
The workaround consists in activating any other monitor for the QOS "QOS_JVM_THREADCOUNT" in order to create the definition on the DB. Once it is created, the QOS from the monitor
will be stored correctly.
1. Activate the QOS for the monitor "PeakThreadCount" (under the same folder under threading) - by default it defines: QOS_JVM_THREADCOUNT
2. Apply and save.
3. If you don't want to monitor "PeakThreadCount" deactivate it.
4. ThreadCount QOS is now stored on DB as definition was created by PeakThreadCount so
QOS is now stored.
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