Comment 8 for bug 1491509

Reviewed: https://review.openstack.org/310983
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=8dd821a03dcff45258251bebfd2beb86c07d94f7
Submitter: Jenkins
Branch: master

commit 8dd821a03dcff45258251bebfd2beb86c07d94f7
Author: Wenzhi Yu <wenzhi_yu@163.com>
Date: Fri Apr 29 11:14:39 2016 +0800

    Drop timestamping in pollsters

    Many of the pollsters define the timestamp individually for each
    generated sample, which should really be timestamping based on when
    the data was polled and not when each sample is generated. We need to
    set the timestamp of the polled data to the timestamp when the polling
    starts for unity.

    Previous commit be3f7fb8300e8853ebd35986cdf159422aa247a already unified
    the timestamp in samples, and now drop the timestamping in pollsters.

    Change-Id: I9c3047e70fcd6c02278dee91603e2aeb2ca8b8c8
    Closes-Bug: #1491509
    Implements: blueprint unify-timestamp-of-polled-data