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>> 2. Return an empty list and in the same microversion change that 404 -> 
>> empty response behavior even if not filtering by service_host (so just 
>> filtering by hypervisor_hostname_pattern).
>>
>>  From the review it sounds like most people (myself, Alex and Chris) 
>> think we should go with the latter and not perpetuate the former sin.
> for what its worth that would be my preference as well.

+1