Memory leak in Ubuntu 16.04.2 x64 droplet?

Hello!

I’ve started droplet with Ubuntu 16.04.2 x64 and just left it there running for 6 six days. The interesting thing is - during all those days memory consumption was increasing linearly.

Here is the screenshot of memory usage graph from my “Graphs” dashboard today: http://imgur.com/a/yHdUs

You see, that left untouched, the standard droplet consumed at the end ~41.5% of memory o_O

The break at the end is me rebooting the droplet.

Several hours after reboot, still untouched, still eating the memory insistently:

Here is the new memory graph screenshots http://imgur.com/a/TQbue: a) graph b) graph with details at 12 pm c) graph with details at ~4pm

So, it went from 14.74% up to 15.69% in nearly 4 hours.

Is it something really wrong with this base droplet image?..