The tasks is about displaying of an information message after performing some action which does API call. The call can be executed basically everywhere (update, action from action list/panel, result of some dialog). Multiple calls can be issued in batch commands -> multiple messages can be returned at the same time.

The message is an additional information in a result of a successful(IMO most of the cases) or failed command.

We already show a notice after successful update/add/delete/... but it fades after 3s. It may be somehow combined.

There is not a Web UI use case for it yet, the feature was originally developed for CLI https://fedorahosted.org/freeipa/ticket/2346#comment:8 but as a part of API it will most likely affect Web UI in a future.