Fan entities not exposed in Prometheus metrics about core HOT 3 OPEN

Hey there @knyar, mind taking a look at this issue as it has been labeled with an integration (prometheus) you are listed as a code owner for? Thanks!

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prometheus documentation
prometheus source
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from core.

I believe this is a bug because the documentation states:

By default, no entity will be excluded

I suspect what that note is intended to do is describe the default behaviour of the filter configuration parameter, since it's in the Configure filter section of the doc. But I agree it can be interpreted to mean that the Prometheus integration automatically supports all (existing and future) Home Assistant entities, which is not accurate.

Would you be interested in also sending a PR to make the documentation more clear? Perhaps it might be sufficient to mention that each Home Assistant entity domain is instrumented explicitly, and many domains currently have no Prometheus metrics defined for them.

from core.

I've made a small PR to clarify this in the docs.

from core.