Thanks to @raygunio for ❥ sponsoring!
They've got Alerts now and they are nicely implemented. It's deliciously simple:
1️⃣ When [this metric]
2️⃣ Hits [this threshold]
3️⃣ Email [these people]
Could be a performance metric like CWV, error spike, etc.
https://css-tricks.com/quickly-get-alerted-to-front-end-errors-and-performance-issues/