Swap is low so that is good. If there are performance issues swap would increase.
Linux takes as much memory as it wants unlike Windows.
Run some basic health checks like HCP to see if there are indeed any issues.
Check monitoring if there is a memory leak (slow increase every day of memory use)
Only if there is a memory leak action is needed because this will crash the gateway at one point.
I am more worried about the CPU load, You have a load of 5 and only 4 CPU's
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