- POST /api/v1/webhooks/alertmanager accepts Prometheus Alertmanager format - Internal IPs (192.168.x.x, 10.x.x.x) bypass HMAC verification - Converts Alertmanager alerts to Signal format → Redis Stream - External IPs must use /signals with HMAC Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>