Enable Manage-Service feature in scale out deployment

In a scale out environment, cloud provider start to run many heat-engines to server the load of huge requests at the given point in time. Once many engines are started to run, current service API does not have following functionalities, Which I would expect for listing the services.
 - Pagination :
  ○ Start_index: (service_id)
  ○ Number_of_records: (default=20)
  ○ Always sort by created_at filed during the list.
 - Search by hostname
 - Search by up/down status

Add pid into Service
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When multiple heat-engines are running, it is difficult to find out the processed for a given heat-engine. This is required during trouble shooting the issues. So as a could admin, I would like to get the process id (pid) for the given service