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.. _metrics:
Metrics operations
======================
libuv provides a metrics API to track the amount of time the event loop has
spent idle in the kernel's event provider.
API
---
.. c:function:: uint64_t uv_metrics_idle_time(uv_loop_t* loop)
Retrieve the amount of time the event loop has been idle in the kernel's
event provider (e.g. ``epoll_wait``). The call is thread safe.
The return value is the accumulated time spent idle in the kernel's event
provider starting from when the :c:type:`uv_loop_t` was configured to
collect the idle time.
.. note::
The event loop will not begin accumulating the event provider's idle
time until calling :c:type:`uv_loop_configure` with
:c:type:`UV_METRICS_IDLE_TIME`.
.. versionadded:: 1.39.0
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