Biggest change in the release, IMO: https://grafana.com/docs/grafana/latest/alerting/unified-ale...
However, it does now support queries like `host=*` with multiple alerts instances per host from one rule/query. E.g. https://github.com/grafana/grafana/issues/7832#issuecomment-...
When you get a notification, you have a link to the appropriate dashboard and it is also easy to create an alert from a query in a dashboard. You can see the linked alert rule in the panel edit mode.
Can't wait to fire this up and start re-doing all my alerts.