wrong accumulative value of metric "network.services.lb.incoming.bytes"

[Xia Linjuan]

When running the command below, we get the stats of lb pool, the bytes_in value is accumulative.
See [1]https://wiki.openstack.org/wiki/Neutron/LBaaS/API#List_Traffic_Statistics_of_a_pool

# neutron lb-pool-stats Pool_1
+--------------------+-------+
| Field | Value |
+--------------------+-------+
| active_connections | 0 |
| bytes_in | 161 |
| bytes_out | 197 |
| total_connections | 1 |
+--------------------+-------+

But in ceilometer, the sum value will accumulate again, it's not right because the value of bytes_in is already the accumulated value. The command below shows the value of the metric "network.services.lb.incoming.bytes"

curl -s -X GET -H "Content-Type: application/json" -H "X-Auth-Token: 1574fcbba8c14323b2aad120c9e195c7" -d '{"q": [{"field": "resource_id", "op": "eq", "value": "1b0f7100-bef5-4e15-b6b3-c1eff1f750cd"}]}' http://x.x.x.x:8777/v2/meters/network.services.lb.incoming.bytes/statistics
[{"count": 266, "duration_start": "2015-12-29T06:11:19", "min": 0.0, "duration_end": "2015-12-31T02:21:18", "max": 161.0, "sum": 13202.0, "period": 0, "period_end": "2015-12-31T02:21:18", "duration": 158999.0, "period_start": "2015-12-29T06:11:19", "avg": 49.63157894736842, "groupby": null, "unit": "B"}]

It's not consistent with the stats value.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/263329

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/263329
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=99e13d0a8397c463f7b54cb9cf9cb660a6689795
Submitter: Jenkins
Branch: master

commit 99e13d0a8397c463f7b54cb9cf9cb660a6689795
Author: jizilian <email address hidden>
Date: Mon Jan 4 10:24:40 2016 -0500

    wrong accumulative value of "network.services.lb.incoming.bytes"

    According to the wiki[1], the bytes_in in the LBaaS response should
    be a total number. Ceilometer should not accumulate the data again.

    [1]https://wiki.openstack.org/wiki/Neutron/LBaaS/API#List_Traffic_
    Statistics_of_a_pool

    Change-Id: I32ee4b180fc0461d1ce4e98202a6cc50b6bcc781
    Closes-bug:1530793