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Understanding memory usage metrics

At the top of the screen it shows the memory usage as


But further down when I go to System Overview -> RAM it gives me below stats (note, this is a 16GB RAM VM)


Then if i go to Memory section it shows me

I am confused about the information presented in these 3.

Any insight would be highly appreciated.

Thanks @Markos-Fountoulakis for the in-depth reply.

@modithak-K, Markos is our Chief Database Engine reply, so you can be certain that this reply is super on point! If you have any further questions, please do follow up and we will reply!

A good explanation of the breakdown of those dimensions (free, used, cached, buffers, available) is here:

For some more in-depth technical discussion of a relevant bug look here: