Hi. I’ve two Starrocks clusters, one is 3.3 and the other 3.5 version. Upgrading them to 4.0 is just upgrading fe y be nodes to the new docker images? No data migration tasks?

it's ok to upgrade from 3.5 to v4.0 directly. However for v3.3, I'd suggest upgrade to 3.4->3.5->4.0, step by step