@angel701129 @PiBa
I ended up with a similar response after the 2.7 upgrade, it seems odd that this would be changed by the OS upgrade rather than a package change though. Did something change withing the 2.7 version that reverted how the HAProxy config gets written?
In my case specifically it listed '[ALERT] 190/122149 (58497) : parsing [/var/etc/haproxy_test/haproxy.cfg:520] : The 'rspirep' directive is not supported anymore since HAProxy 2.1. Use 'http-response replace-header' instead.'