[keycloak-dev] Guaranteed Backwards Compatibility

Marek Posolda brought up a good point in another thread about certain pieces of Keycloak being guaranteed to have backward compatibility. Is there a guideline for this, a strict outline of what is guaranteed to continue being backwards compatible or any documentation outlining what should be kept strictly compatible during a version change? TLDR; I recognize and understand the semantic versioning (or at least presume to) however I ask this so that I can make sure I consider the list of sacred things (if there is one) and especially take this into account while I design/propose/work on anything within the Keycloak project. I tried Google searching but only found the upgrade docs at keycloak.org/docs/latest/upgrading. Thank you, Justin Gross