Memory Swap full

Hey Nethserverians!
Hopefully, you are doing great! I need your help regarding Swap Memory.
I am using VMware Esxi->Nethserver. having 16GB RAM.
Currently, my Nethserver shows that it has utilized its swap memory at full, and I have no idea, why? last month it was half utilized. I’ve attached the screenshot of swap memory.

Please, your help would be appreciated.

NethServer Version: NethServer release 7.8.2003 (final)
Module: Memory Swap

Memory usage might have hit the swappiness value set in the system config.
Here are some guides on memory optimization:

One of the tools that provide a quick way to find out memory utilization by process is smem (yum install smem).