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Comment: Adding warning about session collisions

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Load Balancing general guidelines

Warning
titleSession Collision Risk

It is critical to correctly configure the sticky session and user IPs to avoid session collisions.

Session IDs are generated by combining the requester's IP and a small
random number. The design assumes that each user has a unique IP and the
random bits are there to distinguish between tabs/windows from the client.

If Tomcat receives the load-balancer IP for every client, the clients will share sessions and see other client's data!

Sticky Sessions

uPortal significantly caches data for a user session.  For best performance a user must maintain a persistent connection with the same server for the duration of their session.  This is often called sticky session.

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