On several wikis, an account named "滥用过滤器" has been created on December 17 to perform some technical maintenance on AbuseFilter. This account has sysop rights but it's a system user and no human can use it. The account already existed on wikis where AbuseFilter can perform blocks, which are issued using this account. See T212268 for more information and future plans.
In AbuseFilter, the "频率控制" action takes three parameters: count, period and groups. They must now strictly respect the requirements listed on mediawiki.org. A list of broken filters is on Phabricator. If you're familiar with AbuseFilter, please take a look and fix them. 
Changes later this week
The new version of MediaWiki will be on test wikis and MediaWiki.org from January 8. It will be on non-Wikipedia wikis and some Wikipedias from January 9. It will be on all wikis from January 10 (calendar).
Search Platform Office Hours is rescheduled to January 9. Check the details for time and date.