Built‑in Alerting vs External Alertmanager: Which Provides Better Dynamic Recipient Templating?

Goal

The aim is to determine which alerting path—Grafana’s built‑in system or an external Prometheus Alertmanager—delivers dynamic recipient templating reliably while avoiding the use of production credentials.

Constraints and Uncertainty

• Built‑in alerting supports a single‑step setup but currently lacks templated recipient support.
• Alertmanager integration adds routing, grouping, and templating at the cost of extra deployment complexity.
• Documentation shows no planned change to Grafana’s native templating capabilities, leaving the future of native support uncertain.

Testing Approach

Both paths can be verified on a local Grafana v10.x instance with a test Prometheus data source, sending notifications to a sandbox email or Slack channel.

Unresolved Questions

• Will upcoming Grafana releases introduce Alertmanager‑style templated recipients in the built‑in alerting engine?
• What is the most reliable way to validate templated notification delivery without exposing production credentials?