[Engineering] MediaWiki and extensions 1.30.0-wmf.14 group1 deployment blocked

[Tyler Cipriani]

The deployment of MediaWiki and extensions version 1.30.0-wmf.14 is 
blocked as a message in the error log gradually worsened following the 
roll out 1.30.0-wmf.14 to group1 wikis. The error:

    Cannot flush pre-lock snapshot because writes are pending

is detailed on phabricator[0].

As of right now, group0 wikis are on php-1.30.0-wmf.14, group1 wikis are 
on php-1.30.0-wmf.13 (excluding wikidatawiki which is on 
php-1.30.0-wmf.11), the remaining wikis are on php-1.30.0-wmf.13.

The types of issues that will halt the train and the process and 
procedures for when the train is halted are detailed on Wikitech[1].  
The current version deployed per wiki is available on the wikiversions 
toollabs page[2].

-- Tyler

[0]. <https://phabricator.wikimedia.org/T173462>
[1]. <https://wikitech.wikimedia.org/wiki/Deployments/Holding_the_train>
[2]. <https://tools.wmflabs.org/versions/>