wait-for.
If -global is specified, the list contains the names of available global notifiers.
Otherwise, the list contains registered notifiers on object or class, or registered notifiers on all classes, if the object and class parameters are omitted. Each entry in the output contains the notifier name, notifier class, notifier description and the list of objects of that class. By default, if no class or object is specified, then notifiers that are pre-defined on all classes are not shown; they can be displayed using the -a flag. Also, by default only notifiers on classes with at least one object are displayed, unless -u is specified.
If name is specified, display data about this notifier only, ignoring -global and -a.
The substr argument can be used to print matching notifier names only.