Instance Mem_UnderProvision

I have one t3.micro instance and it has java sample application running java is consuming approx. 60% of mem where as some other stuff has around 20% totally instance is having 80% of memory utilization.

When I saw my instance it says that under provision then i dig in details in metric tab i see mem is under provision it has 2 graphs current is up to 85-87% and option1 is 40-43%.

I got confused because with same setup i have one more instance which is not showing as under provision what should i do now should i upgrade it.