Transparent Load Balancing in Azure
Published Nov 09, 2020
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There is another similar article that describes the monitor in more detail: https://devcentral.f5.com/s/articles/Failing-Faster-in-the-Cloud
It works out to be a VIP target from a traffic-group-local VIP to a traffic-group-1 VIP to check for which device is "active". The Azure health probe will typically go to the first private IP (hence the need for a VIP target unless you are using a secondary address, but that is not possible with the configuration above).