It's 2 AM. Your monitoring fires. 5,000 messages in the Dead-Letter Queue. What's actually inside those messages Which failure pattern caused this Which messages are safe to replay right now That investigation used to take me 6 hours. It now takes 45 minutes. Not because I got faster — because I built the right tool. ServiceHub is an open-source, self-hosted web application that treats dead-letter queue debugging as the forensic investigation it actually is. Here's what it does that a standard management console cannot: Full message body inspection — click any message, active or dead-letter, and see the complete JSON with syntax highlighting, every system property, and the exact broker error description. Client-side AI pattern detection — clusters your DLQ messages into error groups with confidence scores. Runs entirely in your browser. Zero data exfiltration. No API key needed. Auto-replay rules — define conditions, set rate limits, add exponential backoff. The engine runs autonomously and shows live Pending → Replayed → Success counters. 30-day DLQ Intelligence — persists every scan to local SQLite. Know whether tonight's spike is a new incident or the same pattern from last Tuesday. Correlation Explorer — paste any Correlation ID and trace that message across every queue, topic, and namespace in one search. The entire thing is read-only by design. Uses PeekMessagesAsync — your consumers are never affected. Works with Listen permission only. bash https://github.com/debdevops/servicehub.git One command. Auto-installs .NET 10 and Node.js. Open http://localhost:3000. Or try the hosted demo in 30 seconds — no install: https://app-servicehub-prod.azurewebsites.net/ The hosted version authenticate via Microsoft Entra ID (Azure AD). No user database. No personal data stored. Connection strings AES-GCM encrypted at rest in your session. What does your current DLQ investigation workflow look like? Drop it in the comments — I'm genuinely curious what the most painful part still is. ⭐ GitHub: https://github.com/debdevops/servicehub — MIT license, PRs welcome.