FYI: Emergency TCW this Saturday, February 20, 0600-1000 PT

tl;dr: this will be a "Soft Close" to deal with glibc updates

As most of you know, upgrading glibc requires a reboot of each Linux host.
With so many hosts needing to be rebooted, there will be impacts on the
build and test machinery.

We fully expect the system to self-recover, but jobs in progress may burn.
So we are calling this a "Soft Close". While the trees remain open, devs
are expected to monitor their own jobs, and restart or cancel as needed.
Or, just enjoy a few more hours away from the keyboard.

Thanks for your understanding,
--Hal
for the many Mozilla teams coordinating our response.