ATTR_BLOCKING_CPU_TIME: "lk.blocking.cpu_time" = 'lk.blocking.cpu_time'

CPU consumed by the event-loop thread during the stall, in seconds. On Node runtimes without process.threadCpuUsage() (before 22.15 / 23.9) it is process-wide instead, counting the libuv pool and native media threads too, and can then exceed lk.blocking.duration.