Meanwhile, the logging problem is solved upstream (tested with 2.4-dev4-4d71176). With the default config and the rsyslog snippet (49-haproxy.conf) the logs go into haproxy.log again and look like:
Jan 4 11:40:53 haproxy-test haproxy[411079]: 81.XXX.XXX.142:36800 [04/Jan/2021:11:40:53.782] test-2222 http-2222/web1.backup.example.com 1/0/32 4081 -- 1/1/0/0/0 0/0 -- Berner Fachhochschule / Bern University of Applied Sciences IT-Services / Team Linux & Infrastructure Services Katharina Drexel IT System Engineer ___________________________________________________________ Dammweg 3, CH-3013 Bern Telefon direkt +41 31 848 48 87 Telefon Servicedesk +41 31 848 48 48 katharina.dre...@bfh.ch https://bfh.ch https://bfh.science