Rudder

Doc https://docs.rudder.io/reference/9.0/installation/versions.html#_rudder_versioning is not up to date

An upgrade path from one major version to the next will always be provided (i.e., upgrading from 5 to 6 is supported, and from 6 to 7 is too, but upgrading directly from 5 to 7 will generally not be – check the upgrade section of the user manual for specifics). They are released approximately every 9 to 12 months.

major version are every 18 or 24 months, and upgrade are only following the upgrade window (latest minor of a branch to the next branch)

Y version increments are minor releases. These versions include small new features and various improvements, but no major change in the architecture of Rudder. An upgrade path from one minor version to the next ones (for a given major version) will be provided – check the upgrade section of the user manual for specifics). They are released every few months.

Minor versions are every 6 months