Merge branches/quickjs to trunk. This is the way.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3621 ed5197a5-7fde-0310-b194-c3ffbd925b24

deps/libuv/docs/src/metrics.rst

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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