1 2.. _metrics: 3 4Metrics operations 5====================== 6 7libuv provides a metrics API to track the amount of time the event loop has 8spent idle in the kernel's event provider. 9 10API 11--- 12 13.. c:function:: uint64_t uv_metrics_idle_time(uv_loop_t* loop) 14 15 Retrieve the amount of time the event loop has been idle in the kernel's 16 event provider (e.g. ``epoll_wait``). The call is thread safe. 17 18 The return value is the accumulated time spent idle in the kernel's event 19 provider starting from when the :c:type:`uv_loop_t` was configured to 20 collect the idle time. 21 22 .. note:: 23 The event loop will not begin accumulating the event provider's idle 24 time until calling :c:type:`uv_loop_configure` with 25 :c:type:`UV_METRICS_IDLE_TIME`. 26 27 .. versionadded:: 1.39.0 28