Hey @gabri
It took a little longer than expected, but we have updated the docs for SonarQube Community Build. You can find the docs here.
To summarize: For Community Build, you will need to update to the December release in a given year before moving. Effectively – December releases of SonarQube Community Build will behave as LTA releases do for SonarQube Server (milestone releases you must upgrade though).
Today the upgrade path from 9.9 is 9.9 → 24.12 → 25.3
In January 2026, the upgrade path from 9.9 will be 9.9 → 24.12 → 25.12 → 26.01.
Strictly speaking, because we are late in deciding this, it is technically possible to upgrade from 9.9 directly to 25.3. This will not be possible starting from 25.4.
I’ve updated my upgrade calculator, which is still being targeted for inclusion in the official docs.