In Applicare, we can enable end user monitoring by enabling the "End User Experience Profiling" aspect from overview screen. Once this aspect is enabled, behind the scene Applicare will automatically inject its RUM script in the web pages of monitored applications.
We can also inject this script manually in your application web pages and redeploy the code to collect EUM data. Refer this link for Manaul Applicare eum script injection.
The script arc-nav.js is using the Navigation API to calculate different parameters like Document download time, Document process time, Server connection time, Response available time, Rendering time, Dom ready time, Resource fetch time.
The script arc-eum.js is using BoomerangJS open source middleware to calculate Page load time, Network time, Browser details.