"5xx alarm fired" is not a page — it's a guessing game. Radar's pages include the failing service, the dominant error, the correlated deploy, the customer-impact verdict, and a confidence score. Open Slack, read one message, decide.

p99 latency rose to 11.4s (baseline 2.1s) shortly after deploy v3.42.1. Cascading 5xx on users-api via job-events queue (depth ×4.2).
14:25 · auto-rollback completed. Watching for recurrence over next 30m.
14:55 · No recurrence. Marking resolved.
The headline tells you the verdict. The body tells you why. The thread tracks the resolution.
Related blips and the resolution itself land in the same thread — your channel stays clean.
Same payload, multiple destinations. Route critical pages to your on-call rotation.
Add Slack with one OAuth click, or paste a generic webhook URL.
Subscribe each channel to specific services or tiers from the service map.
Mute confidence < medium, or noise-suppress a known recurring finding from the alert itself.