[Feature Request]: Add CPU usage to host Metrics

[marshalleq]

Platform

Cross-Platform

Description

I realise there can be a slight performance penalty for this which is why I think it should be more like an opt in toggle for debugging, however I'm interested to know how for example a high site node is performing and whether cpu is a bottleneck, in particular on the single core low power devices.

Would it be possible to get this added in somewhere?

It's my understanding this could potentially be implemented by leveraging FreeRTOS's run-time statistics capabilities (detailed at https://www.freertos.org/Documentation/02-Kernel/02-Kernel-features/08-Run-time-statistics), which involves enabling configGENERATE_RUN_TIME_STATS and configuring the associated timer macros.

Thanks.

[mverch67]

I would expect the arduino loop() polling to eat up 100% CPU all the time and therefore doesn't let the FreeRTOS idle task run to count its idle time.
A solution would require to measure the runtime of a single loop walkthrough and to calculate according expected runtime (based on actual CPU and frequency) an estimated "idle" time / percentage value.