Proposal: Notification function

We discussed about how to inform users that their ITs will be terminated after 24h. There were several suggestions: The website, training material, as static text in the 'running ITs' window and a notification that is send to users.
So I came to the idea that maybe TPV can send notifications to the user via the Galaxy API. These could be specified e.g. similar to the `fail` message and be triggered by a rule like:
~~~
- if: input_size > 10
notify:
msg:
subject: "Tool suggestion for *small file Tool*",
message: "Please consider using the *tool for larger input files*",
category: "info"
# OR
- if: true
notify:
subject: "24h lifetime for Interactive Tools",
message: "For giving everyone a shorter waiting time we terminate Interactive tools after 24h",
category: "warning"

~~~

Please share your opinions and ideas