Excessive memory usage after updating to 11.9.6 Enterprise

On 4/24 we updated out local GitLab Enterprise Edition to version 11.9.6. We were on 11.3 before. Shortly after the update we noticed higher memory usage and added more memory on the server. We went from 4GB to 16GB and added two additional CPUs to the server for a total of 4. Our peak user level is 98. Based on the documentation 8GB should have been more than enough memory to support 100 users. We went to 16GB to give us some breathing room. We added the memory and CPU cores last Friday. We are currently using 14GB of memory and 2GB of swap.

Here is a graph of the recent memory usage:


Can someone point me were to look for what is causing the memory usage?