Web Server Balancer Configuration

I'm confused by the modules required for a load balancer.

* mod_proxy_balancer and one of the load balancing scheduling modules:
- mod_libmethod_byrequests (request counting)
- mod_ibmethod_traffic (weighted traffic counting)
- mod_libmethod_bybusyness (pending request counting)
- mod_ibmethod_heartbeat (heartbeat traffic counting)

Some of the above refer to mod_lib and some to mod_ib -- typos?

Further in the configuration example is what appears to be "lbmethod" ("LBmethod" -- load balancing):

ProxySet lbmethod=byrequests # balancer setting, round-robin

Also, my a2enmod tab-auto-complete isn't helping me find any related modules except proxy_balancer.

How do I enable the other required load balancing scheduling modules?

Oh...

Having re-read my post in editing, I see the "LBMETHOD" is correct and all "LIBmethod" and "IBmethod" are typos.

I have the 4 options of load balancing method modules:

lbmethod_bybusyness
lbmethod_byrequests
lbmethod_bytraffic
lbmethod_heartbeat

Interesting that no one seems to have noticed this before.

Perhaps an update to material is justified?

Thanks.