Call distribution doubt on ArcGIS Server cluster

[VirgilioPalmi]

Hi thanks to ArcGIS Monitor, I'm noticing a strange thing on a cluster with 4 Utility Network services published on it.
the ArcGIS Enterprise version is 11.3.
in front of ArcGIS Server there are a couple of WebAdaptors.

I'm noticing through the monitor, that when there are peaks of calls, these are distributed mainly on two nodes, I would expect that with a cluster of 10 ArcGIS Servers that "50%" is spread across all the nodes.

am I thinking wrong?

Virgilio

[TimoT]

This aligns with testing I did a couple of years ago.

Web adaptors function as very basic load balancers that lack logic around traffic distribution. 

If you need true load balancing, you may need to consider integrating a third party load balancer into your architecture.