It has been noted today that urls to dashboards (i.e. in notes_url in icinga config) are not output to irc with ampersands in the query string, thus making the links not as useful. AFAICT the last message with & was on Nov 12th (reported below), which is one day earlier than when we switched to newer icinga on stretch in T202782. I'm assuming the upgrade is related and possibly the root cause.
20:05:45 -icinga-wm:#wikimedia-operations- PROBLEM - Memory correctable errors -EDAC- on thumbor1004 is CRITICAL: 4.001 ge 4 https://grafana.wikimedia.org/dashboard/db/host-overview?orgId=1&var-server=thumbor1004&var-datasource=eqiad%2520prometheus%252Fops