Dyanmics 365 maintains Trace records for troubleshooting things like Server-Side Sync. Inspired by this article, https://blogs.msdn.microsoft.com/crminthefield/2017/11/06/is-dynamics-365-server-side-sync-filling-up-your-database/ I have started using Bulk Delete to clear out older Trace logs.
I use the criteria Level = Information or Warning.