V4 to v5 migration guide
Since version 5.* is a different major version than version 4.*, some things have been changed in a backwards incompatible manner. This migration guide is here to help you with the transition.
Migrating the configuration
This section details which changes you need to make to the configuration file.
The default value for FQDNLookup has been changed. It used to be disabled by default and it's now enabled by default. You can use "
FQDNLookup false" to configure the old default behavior. Enabling this option is recommended though.
Migrating existing RRD files