WordPress at a glance
filter is not described

(action) filter-hook . WC 1.0

Usage

add_filter( '(action)', 'filter_function_name_6194' );
function filter_function_name_6194(){
	// filter...

	return ;
}

Where the hook is called

WC_Email_Customer_Invoice::get_subject()
WC_Email_Customer_Invoice::get_heading()
the_block_editor_meta_box_post_form_hidden_fields()
wp-admin/includes/post.php 2222-2228
do_action_deprecated(
	$action,
	array( $post ),
	'5.0.0',
	'block_editor_meta_box_hidden_fields',
	__( 'This action is still supported in the classic editor, but is deprecated in the block editor.' )
);

Where the hook is used (in WC core)

Does not used.