Malfunctioning devices are small part of the issue. One can understand how the workload strains the system via the sounds it (used to) make. Graphs and logs pr

Malfunctioning devices are small part of the issue. One can understand how the workload strains the system via the sounds it (used to) make. Graphs and logs provide a proxy to that data at best, and attaching a debugger, tracer, or perf tool is not an option all the time. Sounds and LEDs provided an overhead-free real time communication channel to the operation of the system.