A deploy platform's reputation comes from its worst failure. Not its feature list. The worst failures are quiet ones: a health check that passes on a container that already died, a certificate that fails to renew at 3 a.m., a rollback target that got garbage collected.

Part 7 of 7 in the Deploy and operate Levelrail series: 1. Install a Self-Hosted PaaS on Your Own Server in Five Minutes ; 2. Roll Back a Failed Docker Deploy Without Downtime ; 3. Restart a Docker Container Without Downtime ; 4. Node Graceful Shutdown in Docker: Handle SIGTERM on Deploy ; 5. Update the PHP Docker Image Security Patch, No Downtime ; 6. Docker Container Restarting in a Loop: 5 Causes, Fixed ; 7. Why a Failed Health Check Still Went Live (this post).

We build Levelrail , a self-hosted deployment platform. During a local dogfood run on 2026-09-27 we found one of those quiet failures in our own code. This is the writeup.

What we saw

The test was simple.…