@GET @ApiIgnore // until documented
  @Produces("text/plain")
  public Response getInstances(String body, @Context HttpHeaders headers, @Context UriInfo ui) {
    return handleRequest(headers, body, ui, Request.Type.GET,
        createInstanceResource(m_feedName, null, ui));
  }
Handles GET /feeds/{feedID}/instances and /instances
Get all instances for a feed.

@param headers http headers
@param ui      uri info
@return instance collection resource representation
ambari-server/src/main/java/org/apache/ambari/server/api/services/InstanceService.java