Honest question, how do you handle high cardinality data points?

Reference to where my brain is at: https://www.robustperception.io/cardinality-is-key/

I feel like splunk’s business model favors a healthy system and gives major disadvantages to an unhealthy one. What I mean in an example: when the system is unhealthy, I know it because all my splunk queries get queued up because everyone is slamming it with queries. I hate it.

But I’m stuck in knowing how to move some things to Prometheus. Like say we have a CustomerID and we want to track number of times something is done by user. If we have thousands of customers, cardinality breaks that solution.

Is there a good solution for this?