The Docker health check was attempting to bind to ports already in use by
the running application, causing "address already in use" errors. This fix
adds a health check mode that skips network binding operations while still
validating output configuration (listen addresses, paths, etc.).
Changes:
- Add health check mode flag in pkg/poller/outputs.go
- Update prometheus and webserver DebugOutput() to skip port binding in health check mode
- Maintain full configuration validation without network conflicts
Fixes#892🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
