WordPress at a glance
action is not described

rest_delete_comment action-hook . WP 4.7.0

Fires after a comment is deleted via the REST API.

Usage

add_action( 'rest_delete_comment', 'action_function_name_4830', 10, 3 );
function action_function_name_4830( $comment, $response, $request ){
	// action...
}
$comment(WP_Comment)
The deleted comment data.
$response(WP_REST_Response)
The response returned from the API.
$request(WP_REST_Request)
The request sent to the API.

Where the hook is called

WP_REST_Comments_Controller::delete_item()
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php 853
do_action( 'rest_delete_comment', $comment, $response, $request );

Where the hook is used (in WP core)

Does not used.