Add support for notifications and system messages

[gsingers]

It would be useful to be able to provide info about the system as notifications (downtime, new features, etc.)

To do this, we should just have a "messages" collections where we can store and load from and then hook into the display.

We will also need to add support in the UI for displaying the messages.

[Pthinker]

I'll take this one

[Pthinker]

@gsingers : I am assuming I need to create a message collection in bootstrap.py.
Question is when and who will add messages into this collection? And how will the UI know there is an updated message (should front end display whenever there is a new message?) ?

[gsingers]

I am assuming I need to create a message collection in bootstrap.py

Yes.

Question is when and who will add messages into this collection?

I think we could do it via bootstrap and a flag (bootstrap.py --add_message message.json) or the like

And how will the UI know there is an updated message (should front end display whenever there is a new message?

I think the message would have things like: active flag, start/end date (range query)