How to Use Browser RUM and Browser Synthetic Monitoring Together
Identify Issues
Although Browser RUM can detect certain kinds of problems (like JavaScript exceptions), it cannot comprehensively test for functional correctness. For example, you may want to verify that your online store has reasonable prices a list of items. If your site is down entirely, then the JavaScript Agent will never be loaded, so errors or verifications will not be reported. Fortunately, Browser Synthetic Monitoring will keep running, discover the error, alert you, and provide detailed information about the problem.
Control Environmental Factors
Hardware, browsers, operating systems, and networks complicate performance analysis in Browser RUM. Browser Synthetic Monitoring uses consistent hardware, software, and network configurations you set when you create a synthetic job, so if you see deviations in performance, you can be fairly certain a problem exists.