Difference between Grafana alerting and Mimir alerting

Hi Grafana users, whats the difference between Grafana alerting and Mimir alerting?

Mimir has an independent alertmanager that you can run as a microservice: https://grafana.com/docs/mimir/latest/operators-guide/architecture/components/alertmanager/

Grafana alerting = grafana executing alert queries and firing alerts, mimir alerting = mimir ruler executing alert queries and the alertmanager fires the alerts