A webhook service that converts Prometheus Alertmanager payloads into rich Slack Block Kit messages with alert grouping and inline actions

Prometheus Alertmanager's native Slack receiver produces plain text notifications that are hard to scan, have no visual hierarchy, and offer no interactive buttons. A lightweight webhook bridge sits between Alertmanager and Slack, receives the standard webhook payload, and re-renders it as fully structured Block Kit messages: collapsible alert groups, severity color bars, label tables, Runbook and Grafana deep-link buttons, and Acknowledge or Silence inline actions. Teams drop it in as a single container alongside Alertmanager with one config change; no Alertmanager fork, no Kubernetes-specific controller, no observability platform subscription required.