db1134 paged for high replication lag:
`22:07:54 <+icinga-wm> PROBLEM - MariaDB Replica Lag: s1 #page on db1134 is CRITICAL: CRITICAL slave_sql_lag Replication lag: 1468.87 seconds https://wikitech.wikimedia.org/wiki/MariaDB/troubleshooting%23Depooling_a_replica`
We depooled it: `!log rzl@cumin1001 dbctl commit (dc=all): 'depool db1134', diff saved to https://phabricator.wikimedia.org/P14310 and previous config saved to /var/cache/conftool/dbconfig/20210211-031048-rzl.json`
As of this writing, still digging into why, although the graphs suggest whatever happened happened at 2245: https://grafana-rw.wikimedia.org/d/000000273/mysql?orgId=1&var-server=db1134&var-port=9104&from=1613006340000&to=1613013540000
And @colewhite notes `Feb 11 02:42:44 db1134 mysqld[3122]: 210211 2:42:44 [ERROR] mysqld got signal 7`, and that the syslog indicates memory corruption.
#DBA, I'm leaving it depooled overnight for you to investigate during your working hours. <3