Comment 9 for bug 1240043

Since the fix released was targeted for V3 REST API, which is not supported currently, we still don't have consistent format of diagnostics data output for different virt drivers. At the moment, the nova diagnostics + libvirt returns:

Response - Headers: {'status': '200', 'content-length': '675', 'content-location': 'http://10.109.3.3:8774/v2.1/servers/d782a127-1648-4759-9c6d-639c39e70c4f/diagnostics', 'x-compute-request-id': 'req-301bd0d7-ebf4-4ef7-9e71-8b6e495cc5c9', 'vary': 'X-OpenStack-Nova-API-Version', 'connection': 'close', 'x-openstack-nova-api-version': '2.1', 'date': 'Wed, 29 Jun 2016 14:58:34 GMT', 'content-type': 'application/json'}
        Body: {"tap443f65b3-94_rx_errors": 0, "memory-available": 49056, "vda_write": 214016, "cpu0_time": 12490000000, "memory-major_fault": 11, "vdz_write": 0, "vdz_write_req": 0, "memory-swap_out": 0, "tap443f65b3-94_tx_packets": 9, "tap443f65b3-94_rx": 976, "tap443f65b3-94_tx_errors": 0, "tap443f65b3-94_rx_packets": 12, "vdz_errors": -1, "vda_read": 23142400, "vda_write_req": 36, "memory-actual": 65536, "memory-swap_in": 0, "vdz_read_req": 142, "tap443f65b3-94_tx_drop": 0, "vdz_read": 1731584, "memory-minor_fault": 21668, "tap443f65b3-94_tx": 999, "memory": 65536, "memory-rss": 127992, "memory-unused": 30472, "vda_read_req": 1076, "vda_errors": -1, "tap443f65b3-94_rx_drop": 0}

and nova diagnostics + xenapi returns:

Response - Headers: {'content-length': '669', 'status': '200', 'x-compute-request-id': 'req-c24610d8-c004-444f-8a86-7915e1caa045', 'date': 'Tue, 01 Mar 2016 07:35:45 GMT', 'content-location': 'http://192.168.33.1:8774/v2.1/49bed283a6ab4392a1fef3c1e562440d/servers/5488ffab-1ac2-4718-9da2-2d025bae1c09/diagnostics', 'content-type': 'application/json', 'vary': 'X-OpenStack-Nova-API-Version', 'connection': 'close', 'x-openstack-nova-api-version': '2.1'}
        Body: {"vbd_xvdd_iowait": "0.0", "vbd_xvdd_read": "0.0", "vbd_xvda_write": "0.0", "vbd_xvdd_iops_read": "0.0", "vbd_xvda_avgqu_sz": "0.0", "vbd_xvdd_io_throughput_total": "0.0", "vif_0_tx": "0.0", "vbd_xvda_io_throughput_total": "0.0", "cpu0": "0.0003", "vif_0_rx": "180.5545", "vbd_xvda_iowait": "0.0", "vbd_xvdd_avgqu_sz": "0.0", "memory_target": "67108864.0000", "vbd_xvda_iops_write": "0.0", "last_update": "1456817745", "vbd_xvda_read": "0.0", "vbd_xvdd_iops_total": "0.0", "vbd_xvda_iops_read": "0.0", "vbd_xvdd_inflight": "0.0", "memory": "67108864.0000", "vbd_xvdd_write": "0.0", "vbd_xvda_iops_total": "0.0", "vbd_xvda_inflight": "0.0", "vbd_xvdd_iops_write": "0.0"}

It would be nice do not bury what has been already done (at least, we have https://github.com/openstack/nova/blob/stable/mitaka/nova/virt/diagnostics.py etc.) and to implement a microversion with support of consistent format of diagnostics data