[Tile-serving] [openstreetmap/osm2pgsql] Confusing middle pgsql processing. (Issue #2049)

[Jochen Topf]

This basically goes in the same direction as #207.

What and how things are logged as changed over time and there never was a grand plan how to do this. I totally agree that the logging is hard to understand for somebody new to the project. You really have to know a lot about the internals of osm2pgsql processing to interpret the output. Osm2pgsql internal processing is complex and the question is, how much the user should actually see of how the sausage is made. Maybe we should just move all that logging to the debug mode and only tell the user when we are done? Does the user actually need to know? What information is actually actionable to the user? On the other hand we could add a lot more output, trying to make things clearer, but that would be a lot of information.

So the question is really: What is that output for? And for whom? Currently it is for experts who want to see what's going on, either in their own setups, or, more importantly, when users report problems. @StyXman What do you expect of that output?

Coincidentally I recently added https://osm2pgsql.org/contribute/how-osm2pgsql-processing-works.html to the website to help explain more about what goes on inside osm2pgsql. Could help with figuring out things, although it is just a small part of what's going on.

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