"Round Robin" is a very simple algorithm, and will not take account of the health of an indivdual node. There are a number of different LB algorithms which you can select, depending on what you need - so you may not need to write a custom health monitor.
It might also be worth looking to see why the node is running at 80%, in case there some other problem, but Traffic Manager can adapt to nodes which are congested.
There are a couple of other articles on this, including information on the "Perceptive" LB algorithm.
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Our technical team responded with the following info:
“Version 10.0 has been end of life for some time now. Please upgrade to any of the supported versions of Traffic Manager. Please see upgrade instructions in the links below:
Please note that there actually two separate procedures mentioned in the body of the article.
If you are running a "software" install and have installed the Traffic Manager application on the Linux distribution of your choice, then follow this procedure:
If you have a virtual appliance where the Linux distribution and Traffic Manager application have been bundled together, then this is the procedure to follow:
You can find out more about the TAC Engaged program by clicking on the image below.