Output log of pm2 to syslog.
Previously, this was using the logger command, but it was modified to use POSIX system call.
pm2 module:install pm2-syslog-logger
for example...
:programname, isequal, "chinachu-operator" -/var/log/chinachu.log
:programname, isequal, "chinachu-wui" -/var/log/chinachu.log
:programname, isequal, "mirakurun-server" -/var/log/mirakurun.log