There has been an increase in transaction size error, seeing by the trending at:
https://logstash.wikimedia.org/goto/8f62fe5730a9a938ba5a0f9985abe3bd
They appear to be mostly commonswiki api calls (with referer commons categories -maybe js related?), it could be just traffic pattern related, but maybe worth investigating if there is a root cause.
[12:38] <icinga-wm> PROBLEM - MediaWiki exceptions and fatals per minute on graphite1001 is CRITICAL: CRITICAL: 80.00% of data above the critical threshold [50.0] https://grafana.wikimedia.org/dashboard/db/mediawiki-graphite-alerts?orgId=1&panelId=2&fullscreen