Documentation does not make it clear that micrometer-registry-prometheus dependency is required to use the prometheus endpoint

[benweizhu]

Hi,

I follow the spring boot actuator Spring Boot Document to use Prometheus endpoint.

But it doesn't show until I add the micrometer-registry-prometheus dependency in my gradle build.

implementation 'io.micrometer:micrometer-registry-prometheus'

And this doesn't mention in the document?

[wilkinsona]

Thanks for the report. I can see how the table in the documentation is misleading here as it states that a number of endpoints are enabled by default but that's only true when a required dependency or bean is also available. We documented this in #18352 for the httptrace and auditevent endpoints. We probably need to apply that approach consistently across all of the endpoints or take a different approach.

[wilkinsona]

We're going to remove the misleading enabled by default column and add some more information where needed in the description.