Return
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Title
Derivation errors appearing in logs -
Description
Error message: com.quest.nitro.service.derivation.DerivationReturnTypeException: Expression evaluates to non-numerical type
errors in the logs after upgrading .net cartridges.
Looking at the FMS logs you see the following errors:ERROR [TimeDriven_Worker-7] com.quest.nitro.service.derivation.DerivationCalculation - The following derivation expression fail to evaluate to a numeric value type: com.quest.nitro.service.derivation.DerivationCalculation$ScheduledCalculation@1f4h6j8com.quest.nitro.service.derivation.DerivationReturnTypeException: Expression evaluates to non-numerical type1. Log in to the JMX console (http://FMS_SERVER:port/jmx-console) . You need to use the "Foglight" Account to log into this JMX console (if prompted for the username/password)NOTE: you must already be logged into the UI as the Foglight user.2. Search for the "service=Derivation" link using "Edit | Find on this Page" and then click on the link when you find it.3. Look for the field "DiagnosticRuletteEnabled” attribute, set to True, then be sure to "Apply Changes".4 .Then invoking the diagnosticSnapshotAsString() operation.5. Copy the text from the output and put in a .txt file6. Search for “Error message” message and determine derivation information:normalComplex derivation definition: availability() :DerivatioCalculation for DotNetMonitoredServer calculated by....DerivationRulette for b2837085-fd61-4459-89da-cd6762fe0c45: had error during last evaluation -
Cause
This is a known defect in Foglight caused by a bug referenced by Quest Tracking ID DN-1313 -
Resolution
Under Dashboards, Navigate to Administration | Data | Managed Derived Metrics
Filter byDerived Metric: Availability
scope: DotNetMonitored server
In that calculation, there is a place where you'd seereturn "1";as a string...we just need to change it to return 1; (no quotes)That'll quell the logging...Defect request vfgls-534 has been submitted to Development for a fix in a future release. Please check the release notes of latest software to determine which bug fixes have been included in this release.
The latest version of Foglight can be downloaded at:
https://support.quest.com/foglight
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Defect ID
DN-1313