I don’t know about any existing tool, but just think about where to do it.
From the OP description, they are already building a microservice architecture using the Netflix stack. There must be a repository to configure the name (or URL) for each of the services, and the "config server" or "service registry" will read from this. For me, this is the perfect place to put links to each of the microservice documentation under your own records. Thus, you get the opportunity to maintain documentation and code in one place, and you can also collect runtime information, such as instance / connection counter, if you connect to the configuration / registry server.
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