rename active_tasks_count to num_active_tasks for consistency

tokio/src/runtime/metrics/runtime.rs

@@ -82,11 +82,11 @@ impl RuntimeMetrics {
     /// async fn main() {
     ///    let metrics = Handle::current().metrics();
     ///
-    ///     let n = metrics.active_tasks_count();
+    ///     let n = metrics.num_active_tasks();
     ///     println!("Runtime has {} active tasks", n);
     /// }
     /// ```
-    pub fn active_tasks_count(&self) -> usize {
+    pub fn num_active_tasks(&self) -> usize {
         self.handle.inner.active_tasks_count()
     }
 

tokio/tests/rt_metrics.rs

@@ -82,20 +82,20 @@ fn blocking_queue_depth() {
 }
 
 #[test]
-fn active_tasks_count() {
+fn num_active_tasks() {
     let rt = current_thread();
     let metrics = rt.metrics();
-    assert_eq!(0, metrics.active_tasks_count());
+    assert_eq!(0, metrics.num_active_tasks());
     rt.block_on(rt.spawn(async move {
-        assert_eq!(1, metrics.active_tasks_count());
+        assert_eq!(1, metrics.num_active_tasks());
     }))
     .unwrap();
 
     let rt = threaded();
     let metrics = rt.metrics();
-    assert_eq!(0, metrics.active_tasks_count());
+    assert_eq!(0, metrics.num_active_tasks());
     rt.block_on(rt.spawn(async move {
-        assert_eq!(1, metrics.active_tasks_count());
+        assert_eq!(1, metrics.num_active_tasks());
     }))
     .unwrap();
 }