Document how to choose levels/what they do

[olmari]

I do realise there i no one perfect answer to what settings to do, but i'd appreciate at least definiton of what those states mean and what would be theoretical best settings, if any :)

[erikjohnston]

The optimal setting depends on the room, and basically impossible to guess without trying different values. IME the default levels are usually good, if not necessarily the best.

https://github.com/matrix-org/rust-synapse-compress-state/blob/main/docs/algorithm.md has some words on how this work.

But yeah, I'm sure we can make the documentation a bit better here :)