Add a debug log to show what event is starting

features/cron-event.feature

@@ -158,3 +158,18 @@ Feature: Manage WP Cron events
       """
       Debug: Arguments:
       """
+
+  Scenario: Confirm that cron event run in debug mode shows the start of events
+    When I try `wp cron event run wp_version_check --debug=cron`
+    Then STDOUT should contain:
+      """
+      Executed the cron event 'wp_version_check'
+      """
+    And STDOUT should contain:
+      """
+      Executed a total of 1 cron event
+      """
+    And STDERR should contain:
+      """
+      Debug: Beginning execution of cron event 'wp_version_check'
+      """

src/Cron_Event_Command.php

@@ -243,6 +243,7 @@ public function run( $args, $assoc_args ) {
 
 		$executed = 0;
 		foreach ( $events as $event ) {
+			WP_CLI::debug( sprintf( "Beginning execution of cron event '%s'.", $event->hook ), 'cron' );
 			$start  = microtime( true );
 			$result = self::run_event( $event );
 			$total  = round( microtime( true ) - $start, 3 );