(As this has been marked with user-notice.)

How tentative is that date? Is it worth spreading the word mentioning at specific date yet?

It's dependent on a kernel upgrade due to be released on the 19th. That has already been rescheduled once. I wish I could provide a degree of certainty but it is not dependent on something we control. But it does look like it's not going to be rescheduled. I would suggest we spread the word and just re-spread it if we have to reschedule.

The date is no longer tentative. It's now fixed.

It was included in the issue of Tech News that went out yesterday.

Per @akosiaris ' last comment, I've taken the liberty to update the task description to reflect the now non-tentative date.

This is happening now.

Mentioned in SAL (#wikimedia-operations) [2017-06-21T10:35:28Z] <akosiaris> rebooting the entire codfw ganeti cluster for kernel upgrades. Silenced hosts in icinga already. T167643

Change 360629 had a related patch set uploaded (by Alexandros Kosiaris; owner: Alexandros Kosiaris):
[operations/puppet@production] Switch codfw puppetdb hosts to eqiad

https://gerrit.wikimedia.org/r/360629

Change 360629 merged by Alexandros Kosiaris:
[operations/puppet@production] Switch codfw puppetdb hosts to eqiad

https://gerrit.wikimedia.org/r/360629

This has been completed successfully. I see 92 users (well bots actually/probably) already in #en.wikipedia and another 64 in #de.wikipedia. ClueBot_NG is among them. That's a bit lower than the 120 and 75 respectively we had before the reboot, but that's probably clients not behaving very well to disconnections. Overall this has gone very well, I am gonna leave the task open for a few days for monitoring.