[Engineering] 1.28.0-wmf.0 on hold for now

[Chad Horohoe]

Hi,

When we deployed the first 1.28 release to the cluster yesterday, we got a
new error[0] relating to
unserialization of redis data. It's pretty spammy already, so I'm paranoid
about deploying wider until
we figure out why. Deploying some debugging work soon so we can figure out
what's going on.

If you've got any information you think would help, please chime in on the
bug.

-Chad

[0] https://phabricator.wikimedia.org/T134923
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