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Question How often does the data purge activity occur for EUM resource snapshots when the retention policy configuration is set? Answer For the on-premise EUM Processor, the expiration check happens once every hour.   The data purge that occurs as part of the retention policy also happens with every check. This is due to the fact that if we were to only check once every day, our retention policy of 15 days may become 16 days, which is undesirable. ... View more

Question Is it possible to set up multiple Synthetic Private Agents on the same server?   Answer As per the current model, if you install multiple Synthetic Private Agents tagged under same ID on same machine, it won't work properly since we need to take screenshots of sessions from browsers on the machine. If two agents are running on same machine, it won't give expected results. The solution to this would be set multiple Private Agent machines and tag them all under same name and ID for the Private Agent. They will form a cluster on their own in this way and you can then execute multiple jobs without any issues. ... View more

Issue While creating an EUM app in an on-premise Controller, it fails with the error   "internal server error. See server.log"   The Controller UI gives the same error when tried with  "Create an Application manually" or "Create an Application using the Getting Started Wizard."  This error is even seen when both EUM and Events Service are up.   Diagnosis When checking the Controller's server.log for the same timeframe, it seems like EUM Processor is not reachable from the browser where the Controller UI is accessed to create this EUM app:   Communication failure with service (http://<EUM-HOST>:7001/v2/application/EUM-AAB-AUB/resource-timing): Unexpected HTTP error 500: {"code":500,"message":"There was an error processing your request. It has been logged (ID ecac6f5d92fddeb5)."}|#]   To further validate this, gather the output (o/p) of the following URL from the same browser where this error is seen inside the Controller UI:   http://<EUM-HOST>7001/eumcollector/get-version This would fail as from the same browser the EUM is not reachable.   Solution While creating an EUM app from the Controller UI, the browser validates the communication to the EUM Processor. To resolve this issue, grant  access to the EUM Processor (TCP/7001) from the web browser.   Once this is done, you should be able to create an EUM app successfully.   Note: 7001 is default HTTP port for eum processor. ... View more

A request is considered an outlier in EUM when the EURT (or FET, if the EURT is unavailable) is greater than 5 times the stall threshold.  This has an undesirable effect in that a few outlier data points can skew the metrics significantly.   For more info regarding stalled values in EUM, kindly refer to: https://docs.appdynamics.com/display/PRO44/Configure+Browser+RUM+Performance+Thresholds    Note: For outlier requests, EUM doesn't create browser timing metrics and browser snapshots, but these requests are still sent to Analytics. ... View more