rsyslog configuration without restart

Question

I have a problem with logging. With my configuration below, I have to perform rsyslog restart if I want to have my application log file in /var/log. Also, I have to restart rsyslog it in case of log rotate. What is the proper configuration of rsyslog and systemd service to avoid rsyslog restart?

My configuration: /etc/rsyslog.d/myapp.conf

if $programname == 'myapp' then {
    /var/log/myapp/myapp.log
    stop
}

/etc/systemd/system/myapp.service

[Unit]
Description=myapp

[Service]
User=myapp
ExecStart=/usr/bin/myapp
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=myapp

[Install]
WantedBy=multi-user.target

/etc/logrotate.d/myapp.conf

/var/log/myapp/myapp.log {
  rotate 7
  daily
  size 100MB
  compress
  missingok
  notifempty
  postrotate
    sudo systemctl restart rsyslog.service
  endscript
}

Answer 1

You should be able to tell rsyslogd to reopen the log-files with something like:

/usr/bin/systemctl kill -s HUP rsyslog.service 

I have not yet found how to make it reload its configuration, most hits says you need to restart it to apply new configuration.

I found this serverfault question that links information it is not possible:
https://serverfault.com/q/1053728/343786

And these posts that tells a little about why it is not possible:
https://rainer.gerhards.net/2008/10/new-rsyslog-hup-processing.html
https://github.com/rsyslog/rsyslog/issues/3759

The later refer to RELP that could be used to avoid loosing log messages during restart, see:
https://en.wikipedia.org/wiki/Reliable_Event_Logging_Protocol