Summary
On windows you can restart the webserver by a Service. But how to do this on Linux?
APM 9.30 and 9.40 on RHEL 7.3 and 7.4
Answer
There is a script embedded oob on the APM Server. That seems to do it.
/opt/HP/BSM/WebServer/bin/apache2restart.sh
/opt/HP/BSM/WebServer/bin/apache2restart.sh