samples query fails on mongo instance with data predating the advent of recorded_at attribute

[Eoghan Glynn]

Where the metering store predates the advent of the recorded_at timestamp to samples:

  https://github.com/openstack/ceilometer/commit/0c51a0a6

sample queries that select older datapoints with fail with the mongodb storage driver, e.g.:

2014-02-25 11:57:52.429 31573 ERROR wsme.api [-] Server-side error: "__init__() takes exactly 14 arguments (13 given)". Detail:
Traceback (most recent call last):

  File "/usr/lib/python2.7/site-packages/wsmeext/pecan.py", line 77, in callfunction
    result = f(self, *args, **kwargs)

  File "/opt/stack/ceilometer/ceilometer/api/controllers/v2.py", line 730, in get_all
    for e in pecan.request.storage_conn.get_samples(f, limit=limit)

  File "/opt/stack/ceilometer/ceilometer/storage/impl_mongodb.py", line 768, in _retrieve_samples
    yield models.Sample(**s)

TypeError: __init__() takes exactly 14 arguments (13 given)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/76174

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/76174
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=f984e9d0eb6edab95bcbb435affd078f06005fb1
Submitter: Jenkins
Branch: master

commit f984e9d0eb6edab95bcbb435affd078f06005fb1
Author: Eoghan Glynn <email address hidden>
Date: Tue Feb 25 16:55:46 2014 +0000

    Tolerate absent recorded_at on older mongo/db2 samples

    Fixes bug 1284608

    Prevents failure of a samples query against a mongo-like instance
    (i.e. either mongodb or db2) selecting metering data that predates
    the advent of the recorded_at attribute for samples:

      Ia0ff8bd07fd811fe8d3050d30971a05a277798d0

    Change-Id: If480321923e9166583bbea91c3878950bafbedf1