A nice feature for the coming Xen Orchestra 5.4 release: you already had XenServer backup reports by emails or via XMPP.
Now it works with Slack!
It's really easy to configure, it's just a plugin in XO:
Our Xen Orchestra documentation is up-to-date and configuration on Slack UI is explained there.
And we also support MatterMost (which is an Open Source alternative) :)
Stay tuned for the 5.4 release!