WordPress at a glance
action is not described

action_scheduler_begin_execute action-hook . WC 1.0

Usage

add_action( 'action_scheduler_begin_execute', 'action_function_name_1170', 10, 2 );
function action_function_name_1170( $action_id, $context ){
	// action...
}
$action_id
-
$context
-

Where the hook is called

ActionScheduler_Abstract_QueueRunner::process_action()
action_scheduler_begin_execute
woocommerce/packages/action-scheduler/classes/abstracts/ActionScheduler_Abstract_QueueRunner.php 61
do_action( 'action_scheduler_begin_execute', $action_id, $context );

Where in WP core the hook is used WooCommerce

woocommerce/packages/action-scheduler/classes/abstracts/ActionScheduler_Logger.php 51
add_action( 'action_scheduler_begin_execute', array( $this, 'log_started_action' ), 10, 2 );