To All coming from openHAB 2.3.0 to openHAB 2.4.0 Milestone 6:
Remember the breaking changes that 2.4 brings and deal with them (easy to handle):
Listing important changes for version 2.4.0:
Warning: Astro Binding: The 'kilometer' and 'miles' channels have been replaced by a new 'distance' channel
Warning: Jeelink Binding: The 'currentWatt' and 'maxWatt' channels have been replaced with 'currentPower' and 'maxPower' channels
Warning: WeatherUnderground Binding: A bridge has been added on top of the current things, you need to add a bridge containing your api-key.
Warning: ZWave Binding: Major changes have been merged to support features such as security. All things must be deleted and re-added. Refer to https://community.openhab.org/t/zwave-binding-updates/51080 for further information.
Warning: Synop Binding is now using UoM. 'wind-speed-ms' and 'wind-speed-knots' channels have been replaced by a single 'wind-speed' channel.