tl;dr: All wikis are staying at 1.28.0-wmf.18 for now

Last week all wikis were rolled back to MediaWiki version 1.28.0-wmf.18
due to several problems that were spotted on Friday (2016-09-16)[0][1].

The problems with wmf.19 seemed resolved by Monday (2016-09-19). The
plan was to roll wmf.19 out to all wikis yesterday afternoon and continue
with the wmf.20 branch-cut today as scheduled.

Late yesterday a large performance regression was discovered in

We've paused the rollout of wmf.19 and the branching of wmf.20 to allow
time to investigate the nature of this performance regression.

After there is a better understanding of the performance regression, we
will reevaluate our plans for branching and rollout of wmf.19 and wmf.20.

-- Tyler


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