Comment 34 for bug 1474332

Reviewed: https://review.fuel-infra.org/13916
Submitter: Vitaly Sedelnik <email address hidden>
Branch: openstack-ci/fuel-6.1/2014.2

Commit: b610937a910f2f562fc5692e2dac4cb341e674d3
Author: yanyanhu <email address hidden>
Date: Fri Nov 13 16:31:08 2015

ASG scaling account for cooldown timestamp & in-progress

There are cases where it takes a long time to create a new resource as
requested by the scaling operation on an ASG resource, for instance, a
nova server creation followed by a complex SoftwareDeployment. During
this process, additional alarms may come in but failed to be blocked
by the current cooldown checking mechanism because the very first
timestamp has yet to be generated. This is leading to unexpected size
adjustment to the ASG.

This patch augments the existing cooldown checking mechanism with a
scaling-in-progress test so that additional alarms arriving during
the very first scaling operation will be ignored.

Co-Authored-By: Zane Bitter <email address hidden>
Closes-Bug: #1474332
cherry-pick from e182a57c9a8ba2f5f4203fac3d2aa04d45dffb5e

Change-Id: I73d5deafe7baa8d3ed49ff0e93a7a80137b8ad6a