Ask HN: How complex are your Alertmanager routes?

Alertmanager is a system to group, filter and dispatch alerts generated by Prometheus (and potentially more systems). The flow of alerts is configured via a tree of routes, each related with a receiver (e.g., email, PagerDuty, VictorOps, webhooks).

There are few realistic examples of Alertmanager configurations out there. How complex are your routes in Alertmanager? How many levels of routes do you have? Which labels do you group alerts on? With receivers do you use?