(4) with the labeldrop action, the regex matches against each of the label names (not values). So I think what you want is (untested):
- action: labeldrop regex: replica -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/e37c39d3-1462-4736-9869-68b31e8d73df%40googlegroups.com.

