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[Gary Kotton <1620279@xxxxxxxxxxxxxxxxxx>]

I do not think that this is a bug. The nova_api IP configured in can be an IP address of a VIP of nova-api's. 
We do not need to invent the wheel here

** Changed in: neutron
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1620279

Title:
  Allow metadata agent to make calls to more than one nova_metadata_ip

Status in neutron:
  Won't Fix

Bug description:
  Currently in config of metadata agent there is option to set IP address of nova metadata service (nova_metadata_ip).
  There can be situation that there is more than one nova-api service in cluster and in such case if configured nova metadata IP will return e.g. error 500 then it will be returned to instance, but there can be situation that all other nova-api services are working fine and call to other Nova service would return proper metadata.

  So proposition is to change nova_metadata_ip string option to list of
  IP addresses and to change metadata agent that it will try to make
  calls to one of configured Nova services. If response from this Nova
  service will not be 200, than agent will try to make call to next Nova
  service. If response from all Nova services will fail, then it will
  return lowest error code which will get from Nova (for example Nova-
  api-1 returned 500 and Nova-api-2 returned 404 - agent will return to
  VM response 404).

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