Please see here for more info:
https://azure.microsoft.com/en-us/blog/monitoring-of-azure-expressroute-in-preview/
Start monitoring today
This capability is in preview in West Central US and West Europe Azure regions and should be available in Eastern US and South East Asia in a week. You can enroll in the preview by sending us your workspace information.
For more information, please visit the documentation titled, Getting started with ExpressRoute monitoring.
Figure 1: Network map with health of both primary and secondary connections
Figure 2: Bandwidth utilization across primary and secondary connections