MDL-67211 Tasks: Record when a task is running.

Co-authored-by: Sam Marshall <[email protected]>

lib/classes/task/database_logger.php

@@ -75,6 +75,8 @@ class database_logger implements task_logger {
             'dbwrites' => $dbwrites,
             'result' => (int) $failed,
             'output' => file_get_contents($logpath),
+            'hostname' => $task->get_hostname(),
+            'pid' => $task->get_pid(),
         ];
 
         if (is_a($task, adhoc_task::class) && $userid = $task->get_userid()) {