os_ceilometer role missing functional gate testing of gnocchi storage option

[Travis Truman]

Currently the os_ceilometer role's gate uses the MongoDB backend. Support for the gnocchi metrics backend has been added recently but is not tested in the role gate.

Ideally, both storage backends will be tested in voting gates for the role.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/379634

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/379634
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-os_ceilometer/commit/?id=5ebd74f40f727c69f62f4dfb274dde7766538165
Submitter: Jenkins
Branch: master

commit 5ebd74f40f727c69f62f4dfb274dde7766538165
Author: Travis Truman <email address hidden>
Date: Thu Sep 29 13:56:59 2016 -0400

    Add func_gnocchi scenario gate test

    This gate test omits installation of MongoDB
    and uses gnocchi for all metric storage

    Change-Id: I15fff275b3e5eaecb36a0da01c5aafc824c5a288
    Closes-Bug: #1628952

[Travis Truman (travis-truman)]

Apparently the jenkins job name is now too long for tox to be able to run the scenario test: http://logs.openstack.org/33/381133/1/check/gate-openstack-ansible-os_ceilometer-ansible-func_gnocchi-ubuntu-xenial-nv/24c4a97/console.html#_2016-10-03_14_39_11_899453

[Travis Truman (travis-truman)]

First attempted solution https://review.openstack.org/#/c/381185/, but I clearly lack a sufficient understanding of how all of the CI stuff maps together.

[Travis Truman (travis-truman)]

Role gate scenario is in place but failing as the ceilometer_api is not starting. The api is not starting because the DbHooks class is attempting to get a connection to MongoDB when no mongo install has been done or is in fact required.

Based on feedback from Gordon Chung in #openstack-telemetry - http://eavesdrop.openstack.org/irclogs/%23openstack-telemetry/%23openstack-telemetry.2016-10-04.log.html#t2016-10-04T20:08:57 it sounds like the scenario gate and the role needs further work.

Further work will be:
 * Modify the role to not install Apache or the ceilometer-api upstart/systemd service when Gnocchi is enabled for storage
 * Modify the functional test to not attempt to reach the ceilometer-api when Gnocchi is enabled for storage.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/openstack-ansible-os_ceilometer 15.0.0.0b1 development milestone.

[Steve Lewis (steve-lewis)]

Proper fix for this is blocked by Bug #1624789 and should probably be running the following tempest tests

https://github.com/openstack/ceilometer/blob/master/tox.ini#L28-L36