Investigate recent surge in growth rate of system RAM usage

[bhazzard]

We've seen a recent increase in the growth rate of system RAM usage that seemed to correspond with upgrading to Leap v5.0.0.

This shows a 90 day period for a public api server that was upgraded to Leap v5.0.0:

This shows the same 90 day period for a public api server that is still running Leap v4.0.4:

Note the difference in the rate of increase of system RAM usage between 5.0 and 4.0.

A different node operator provided this data:

("eos-bp24" is running 4.0, "eos-peer72" is running 5.0.)

Note that the rate of increase in system RAM usage is not significantly different between 5.0 and 4.0.

So, we have 2 contrasting data points. Both show that the rate of growth of system RAM usage has recently increased. One suggests that it was caused by 5.0. The other suggests that it was NOT caused by 5.0.