Upsource/Hub Metrics

I have installed the upsource.2.1154 docker image.
When I go to the built-in Hub, and click on the Administration icon (that looks like a hexagon), there is a Metrics option. 
When I click that option, and view the Metrics page, it shows only 359 MB available in the Memory section.
(see image below)
I have 8 GB of RAM available in my machine. My process list shows java processes (owned by 13001 user) that have over 2 GB in RES memory each.  
What is the 359 MB "Available" referring to in the Hub Metrics page? 
The metrics shows that all 359 MB is allocated.  
Should I increase this?  If so, how do I do it? 

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