Email was marked 2019-06-26 15:28:21 UTC and here's the log entry via kibana: https://logstash.wikimedia.org/goto/c3f05e0b84a8f4b2e70f828f3648d326
Nothing else of interest in syslogs or anywhere else. No idea why mcrouter should time out. Nothing interesting in SAL around that time. Keeping the command around in case the mcrouter whine is a ruse:
/srv/mediawiki/multiversion/MWScript.php dumpBackup.php --wiki=cebwiki /srv/mediawiki/php-1.34.0-wmf.8 --plugin=AbstractFilter:/srv/mediawiki/php-1.34.0-wmf.8/extensions/ActiveAbstract/includes/AbstractFilter.php --current --report=1000 --namespaces=0 --output=file:/mnt/dumpsdata/xmldatadumps/temp/c/cebwiki/cebwiki-20190620-abstract.xml.gz.inprog_tmp --filter=namespace:NS_MAIN --filter=noredirect --filter=abstract --skip-header --start=7200001 --skip-footer --end 7210001