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Adds run queue depth, reported as gauges:
elixir.runtime.run_queue.total- all schedulerselixir.runtime.run_queue.cpu- CPU schedulerselixir.runtime.run_queue.io- I/O schedulersThese count how many processes are waiting to run. A run queue that stays above zero means work is arriving faster than the schedulers can drain it, so it is the first thing to look at when latency climbs without CPU being saturated.
All three come straight out of the
[:vm, :total_run_queue_lengths]measurement map that telemetry_poller already emits.