Document how to change port for alarm logger

[minijackson]

Not long ago, I fell into a rabbit hole on why my server.port property was not recognized by Phoebus alarm logger.

After a while, I found out that it's because the -properties /path/to/config.properties argument doesn't forward the loaded properties to SpringBoot. So my solution was to also specify the environment variable SPRING_CONFIG_IMPORT=/path/to/config.properties.

It would be nice if there was an official, documented way of doing this, as port 8080 is used by quite a number of EPICS-related services by default.

[minijackson]

I found #2277 (comment) recently, but as far as I know the -Dserver.port argument is not documented on the Phoebus documentation, and it might get quite annoying if one wants to modify other SpringBoot settings.

[kasemir]

Yes, SpringBoot adds too many dependencies and obfuscates the configuration. We should remove it and have all services use a plain "main()" like the alarm server, scan server, RDB archive engine

[shroffk]

Umm... There are quite a few other benefits of springboot, we are trying to merge 2 startup and configuration processes here which has resulted in some issues. I will look into cleaning it up.

[kasemir]

Nah, it's a complex framework just like Eclipse was. It expects you to know which annotations to add and where to place files without a way to follow breadcrumbs or call trees. In ~4 years there'll be a springboot update that forces you re-do everything.

[georgweiss]

We should make all services Spring Boot-based.