Description
The IP Definitions Database (IPDB, previously known as the IRDB) is merged into the internet service database (ISDB, also known as FFDB).
Botnet C&C IP blocking now uses the ISDB as a source.
Solution
In the License Information table.
Go to System -> FortiGuard, 'Botnet IPs' and 'Internet Service Database Definitions' have the same database version.

Botnet IPs can be diagnosed with the following CLI command.
# diagnose sys botnet-ip {hit | list | find | flush}

When updating object versions from CLI, Botnet IPs is not listed.
Internet-service Database Apps and Internet-service Database Maps are listed, and show the version for Botnet IPs and Internet Service Database Definitions.
# diagnose autoupdate version
......
Internet-service Database Apps
---------
Version: 7.00528
Contract Expiry Date: n/a
Last Updated using scheduled update on Fri Mar 13 12:48:18 2020
Last Update Attempt: Fri Mar 13 16:48:10 2020
Result: No Updates
Internet-service Database Maps
---------
Version: 7.00528
Contract Expiry Date: n/a
Last Updated using scheduled update on Fri Mar 13 12:48:18 2020
Last Update Attempt: Fri Mar 13 16:48:10 2020
Result: No Updates
......