We trying to upgrade from Sonarqube 6.7.5 to Sonarqube 7.5 version for utilizing the external report feature. We use mysql database for this. I see that from 7.9 mysql database support will be deprecated. Will this affect my upgrade and also to which LTS version should I first upgrade before upgrading to 7.5. Can I also get the impact of this upgrade ie which features of 6.7.5 will be lost?
The current* LTS is 6.7. There are no other LTSs between it and 7.5, so you can go there without any intervening upgrades. That said, there are no extra reporting capabilities in 7.5 that were not in 6.7.
Regarding MySQL, support is not deprecated in 7.9, it is removed. However, we’ve provided a free utility to move your data from MySQL to a supported database. See this announcement.