To help you monitor dedicated connections, Dedicated Interconnect reports metrics to Stackdriver. Google collects metrics on your interconnects and VLAN attachments. Monitoring these resources can help you troubleshoot issues with your physical circuits or VLAN.
Google starts reporting interconnect metrics after Google allocates your ports, even before your interconnect is ready to use. That way, you can monitor the circuits while they're being set up and tested.
Google starts reporting VLAN attachment metrics right after you create the attachment. Google reports the number of packets and bytes sent and received.
Data is reported in one minute intervals to Stackdriver and is retained in Stackdriver for 6 weeks.
Go to Stackdriver in the Google Cloud Platform Console to view Stackdriver monitoring dashboards or to define Stackdriver alerts. You can also use the Stackdriver monitoring API to query and view metrics for your interconnect and VLAN attachments.