The problem details explicitly mention an upgrade from version 2.2.2.9 to 2.3.3.7. Additionally, the DNAC version is stated as 2.3.3.7 in the setup information. Therefore, the software version primarily discussed in the documents is 2.3.3.7.
The software version discussed in the provided documents is Cisco DNA Center version 2.3.3.7, specifically highlighted as the version after an upgrade and in setup details.