Hands-On Infrastructure Monitoring with Prometheus

Custom service discovery example

Now that we have an idea of how the adapter works, let's take a look at what we need to implement to have our custom service discovery working. As we saw previously, the adapter uses a discovery.Manager, so we need to provide it with an implementation of the Discoverer interface so that it can run our discovery. The interface looks like this:

type Discoverer interface {    Run(ctx context.Context, up chan<- []*targetgroup.Group)}

The Discoverer interface documentation can be found at https://godoc.org/github.com/prometheus/prometheus/discovery#Discoverer.

This means that we only need to implement the Run function, where we will run the logic of our discovery on a loop, generating the appropriate target groups ...