Triggers for Non-Telemetry customers?

Hey!

I am on a Digital Customer Success team (100+ accounts per person) and am helping build out the program. I have a couple of questions:

1) For non-telemetry (no product usage) insights, what sort of alert widgets did your company create to understand how well or not well the customer is doing? (e.g. high volume support tickets)

2) How did you use the above alerting for non-telemetry to know when to move a customer from Activation --> Adoption and Adoption --> Expansion?

3) What sort of cadence do you require for a CS person to reach out to each customer (e.g. every 30 days each customer should have some sort of check-in)

4) How to know when a non-telemetry customer is at-risk?

5) What best practices/tools did you use to help build your Digital Program?

Thank you in advance!!!