The Azure Load Balancer uses probes to define the health of your servers and services that are leveraging the Load Balancer. There are two different types of probes: the HTTP and the TCP Probe.
For cloud services (such as VMs, web apps, APIs, and more), it uses a guest agent probe. In this scenario, there is a guest agent installed on your VM that responds with an HTTP 200 OK response. Every 15 seconds, the Load Balancer sends a message to the cloud service to which the agent responds. You can also create a custom HTTP Probe with your own logic that overrrides the logic of the default guest agent. The TCP Probe uses a three-way handshake to set up the connection.
When health logging is enabled, the data is stored in an Azure storage ...
