First off thanks for working on this, it's pretty cool.

I'm wondering how the autocompleted options for a component are chosen. When I type googlecloud<TAB> in the exporters section, it automatically adds the following config keys:

  googlecloud:
    project: 
    user_agent: opentelemetry-collector-contrib {{version}}
    destination_project_quota: false
    timeout: "12s"

All but project are not options that users would normally want to tweak. It seems like the defaults come maybe come from the mapconfig default struct tag? I would guess that options with a default are usually the least relevant to users.