Streaming API - Officer Specs

Please may I enquire if there is specification for the Officer Streaming API - in particular I am looking to validate coverage - that is are the any limitations as to the availability in the API for officers and directors associations in Active companies.

Here’s the link: Streaming API: officersStream (company-information.service.gov.uk)

You get to it via: Streaming API: Specification summary (company-information.service.gov.uk)
Click on the stream link (per image)

Then click on the officerStream link (per image)