As described in
http://www.cs.uwaterloo.ca/cscf/about/after-hours-support,
there is a mailing list for urgent after hours problem reports.
Nobody is expected to be on this list,
it's strictly voluntary, for those who might be curious
about such things.
You can subscribe to the list at
https://lists.uwaterloo.ca/mailman/listinfo/cscf-urgent.
Make sure that you use an @cscf.cs.uwaterloo.ca
email address, otherwise the subscription will be rejected.
That's done to provide some privacy for those submitting reports.
While many reports could be public, we know that there are
cases where people do want some privacy.