Notifications for core events

[George Chatzisofroniou]

It would be great if core could provide notifications for more events to support plugins or any new internal functionality like:

- New subscription
- New thread started

Those two notifications seems to be essential for the MM3-Metrics module (https://launchpad.net/mm3-metrics) in order to provide a nice overview of the system activity.

Also, the notification that the core currently provides is that of a new posting. If this notification carried more information like the number of recipients or the message size we could provide additional interesting metrics via the MM3-Metrics module.

[Barry Warsaw (barry)]

I added events for subscriptions and unsubscriptions.

I don't think it's possible right now to add an event for a new thread, since this isn't something that Mailman itself tracks. An archiver would have to send that notification, but that may in fact be impossible for remote archivers.

Actually, I don't think the core currently sends event notifications on postings. Please open a separate issue for that.

[George Chatzisofroniou (sophron)]

Thanks for adding this.

Yes, i guess that threads is a complex issue and i probably need to get with the HK guys on that one. I think that determining threads should be a common service though.

I just requested notifications on postings: https://bugs.launchpad.net/mailman/+bug/1094696