I send out the Wikimedia Highlights blog post every month. This month I ran into a strange error.
Specifically - I previewed my notification on Special:NotifyTranslators. Everything was okay so I clicked send. After a few seconds I got this message (below):
//Database Error: To avoid creating high replication lag, this transaction was aborted because the write duration (6.9671151638031) exceeded the 6 seconds limit.
If you are changing many items at once, try doing multiple smaller operations instead.//
**However**, the notification tool sent out an email shortly after the error message appeared.
There is no log entry for this - https://meta.wikimedia.org/w/index.php?title=Special%3ALog&type=notifytranslators&user=&page=&year=&month=-1&tagfilter=
Any questions feel free to ask.
Edit (adding links): https://meta.wikimedia.org/wiki/Wikimedia_Highlights,_January_2016