systemd (247.3-7+deb11u1 on Debian 11.x) considers them "obsolete" and
emits the following to my syslog:
Standard output type syslog is obsolete, automatically updating to journal.
Please update your unit file, and consider removing the setting altogether.
So we'll remove it altogether, as I'm sticking with rsyslog for now.
ExecStartPre = /bin/mkdir -p -m 1777 /tmp/.pub-inline
ExecStart = /usr/local/bin/public-inbox-httpd \
-1 /var/log/public-inbox/httpd.out.log
-StandardError = syslog
# NonBlocking is REQUIRED to avoid a race condition if running
# simultaneous services
-1 /var/log/public-inbox/imapd.out.log \
--cert /etc/ssl/certs/news.example.com.pem \
--key /etc/ssl/private/news.example.com.key
-StandardError = syslog
# NonBlocking is REQUIRED to avoid a race condition if running
# simultaneous services
-1 /var/log/public-inbox/nntpd.out.log \
--cert /etc/ssl/certs/news.example.com.pem \
--key /etc/ssl/private/news.example.com.key
-StandardError = syslog
# NonBlocking is REQUIRED to avoid a race condition if running
# simultaneous services
PATH=/usr/local/bin:/usr/bin:/bin
ExecStart = /usr/local/bin/public-inbox-watch
-StandardOutput = syslog
-StandardError = syslog
ExecReload = /bin/kill -HUP $MAINPID
# this user must have read access to Maildirs it watches
User = pi