Support sending arbitrary messages to pub client
Git supports this today. So, for instance, GitHub can send a URL to create a pull request from a new branch that was just pushed.
For the pub site, we could support things like
- Tell user one of their packages has been discontinued
- Future: there is a known issue w/ specific version of a package they are using.
etc etc
See also https://github.com/dart-lang/pub/issues/2165
We worry that these messages will be used for annoying purposes such as spamming/advertising.
This is NOT for arbitrary messages from package authors. But from the server. Maybe we already have this...
Ah - gotcha - we don't have this!
We do have specific places to put "discontinued+replaced by" and "retracted". But not a place for an arbitrary message.