add info about downtime to node list and "back online" notification

[rubo77]

When you send a message that a node is back online, you could calculate the time since when it was down and add this info in the mail.

(maybe you could also add some more info to the mail, that could be useful.)

[RalfJung]

Sounds like a good idea. The time should then also be displayed on the node list page. However, I am not sure when I will have the time. Others are welcome to implement this as well, of course. :)

maybe you could also add some more info to the mail, that could be useful

What kind of info are you thinking about?