Over 100 check plugins were touched in this update. For most of these checks it won't be necessary to rediscovery, but once you do, item names on many checks will change.
Service descriptions have also been normalized but to ease the transition from existing setups, the old service description will continue to show on existing installations.
If you have an existing installation and would like to switch to the new service descriptions you can toggle them in: Global Settings ➳ Execution of checks ➳ Use new service descriptions.
Finally, all temperature checks can now be configured through the same rule and support the same features (like configurable unit, support for trend computations, upper and lower thresholds and so on). Unfortunately this means that most existing rules for temperature checks will no longer be applied and disappear from the Host- & service parameters list. Please make sure you carry over all important temperature rules!
You can still see the now deprecated rules through the button Deprecated Rulesets in Host & Service Parameters.