The Hybrid Manager (HM) operator is released independently of Hybrid Manager itself. These release notes describe what changed in each operator release.
A single 2.x operator supports a range of HM versions. To find the operator version that goes with the HM release you're running or upgrading to, see the compatibility matrix.
Releases before 2.0.0
Before 2.0.0 the operator was versioned and released together with Hybrid Manager. Changes to those earlier versions are described in the Hybrid Manager release notes.