End User Monitoring (EUM) Considerations

End User Monitoring (EUM) typically increases the number of metrics collected. Accordingly, the Small Controller profile is not supported for installations that use EUM. A Medium profile running 20+ high-traffic BRUM/MRUM agents should be sized at a specification closer to a Large profile for EUM.

Specifically, EUM impact metrics as follows:

  • Web RUM can increase the number of individual metric data points per minute by up to 22000

  • Mobile RUM can increase the number of individual metric data points per minute by as much as 15 to 25K per instrumented application if your applications are heavily accessed. The actual number depends on how many network requests your applications receive.

  • Monitoring EUM is memory intensive and may require more space allocated to the metrics cache.
Note: The number of separate EUM metric names saved in the Controller database can be larger than the kinds of individual data points saved. For example, a metric name for a metric for iOS 5 might still be in the database even if all your users have migrated away from iOS 5. So the metric name would no longer have an impact on resource utilization, but it would count against the default limit in the Controller for metric names per application. The default limit for names is 200,000 for Browser RUM and 100,000 for Mobile RUM.