Re-designed settings page for Alerting

The new settings page provides you with a holistic view of where Grafana-managed alert instances are forwarded.

Manage which Alertmanagers receive alert instances from Grafana-managed rules without navigating and editing data sources.
Manage version snapshots for the built-in Alertmanager, which allows administrators to roll back unintentional changes or mistakes in the Alertmanager configuration.
There is also a visual diff that compares the historical snapshot with the latest configuration to see which changes were made.