Logging: ship structured log data from the journal to loghost/graylog instead
of using the limited Syslog format. It provides more metadata about log events
and preserves multiline messages from the journal. Syslog via UDP 514 is now
forwarded to the journal except for HAProxy. HAProxy isn't forwarded to Graylog
anymore and only logs to /var/log/haproxy.log.
/var/log/messages is no longer used. (#PL-128336).
Graylog: make telegraf metrics collection work for all nodes in a cluster (#PL-129455).
Webgateway/Nginx: do not remove Accept-Encoding header in recommended proxy
settings which are enabled by default.
This allows backends to send already compressed content, for example (#PL-129611).
Provide further upgrades to modsecurity to ensure stability when using the
OWASP core rules (PL-129610).