We use user-centric performance metrics, you can read here User-centric Performance Metrics  |  Web Fundamentals  |  Google Developers This example code is for GA, it can be adapted to Adobe pretty easily.

Now it is fixed. I opened a ticket, client care escalated to higher prio, as I heard engineer manually killed the building process from server side. It might be some kind of deadlock bug. Even I dont know if they found the problem this time, it would be great to avoid it in future, it had been stuck...

After creating a rule and pressing "Save and build for development" button today, the whole UI has been stuck in building process for hours. I tried to initiate a new building, then both of them appear "pending". Neither Reloading the page nor sign out and -in again solves the issue.Have debugged in...