Alerting: Grafana-Managed Alerting is the default in new stacks

New Grafana Cloud stacks now use Grafana-Managed Alerting (GMA) by default — Datasource-Managed Alerting (DMA) is no longer provisioned in new stacks.

Scope: New stacks only. Existing stacks and existing DMA rules are unaffected. This is a provisioning-time change, not a migration.

The following products now create Grafana alert-rules and recording-rules by default in new stacks: