1. Use rollup_obs_purge_batch script attached to purge rollup observation data
In order to run the script, please navigate to:
Administration │ Tooling │ Script Console
Then click on "Scripts" tab and click on "Add" button, then paste and run the script.
Please check the database size after that.
2. Upgrade to Foglight Management Server 188.8.131.52 as soon as possible.
Note: Support for SQL Server 2016 as Database repository was added starting with Foglight Management Server version 184.108.40.206