How to debug if my miq instances has memory leak?



I am using one big miq vmware appliance(Fine-1-beta2) to manage around 1,700 VMs from different clouds.
Overtime, as shown in the screenshot, the free physical memory will decrease to very low from 30M(M=GB actually) as seen in the screenshot.

When memory is low I see issue of not able to login into web gui. Others report seeing error message related to provision VM.

Today, I decide to raise the RAM from 32G to 45G and watch if memory usage will get close to 45G next week again. This is simple but time consuming way of testing memory leak. Wondering if others have better way to debug memory leak issue ?

following picture is a htop output