Checkmk Werk 15532: Extension packages: Disallow packages with no applicable Checkmk version

ID: 15532 Title: Extension packages: Disallow packages with no applicable Checkmk version Component: Checks & agents Level: 1 Class: New feature Version: 2.3.0b1 Extension packages can specifiy a minimal required Checkmk version, and a Checkmk version when they expire. Choosing those versions carelessly could result in packages with no supported version at all. This is now validated against in the GUI.