a MySQL-query of yours was killed because you didn't mark it as SLOW_OK and it have run for 191 seconds which was longer than allowed. You can find the query below. Please have also a look at [1] to find information how you can avoid killings of your queries. Maybe you can optimze the query too? The replication lag at kill-time was 16220s.
Sincerly, Query-Killer. This eMail was sent automaticaly, please don't reply.
select page_title, page_len, rev_text_id from page left join revision on page_latest = rev_id where page_is_redirect =0 and page_namespace =0 and page_len < 200 ORDER BY rev_timestamp LIMIT 17520
(enwiki)