Cannot turn off event publishing pipeline

[Ashwin Agate]

In pike there seems to be no way to "turn-off" event publishing.

Before pike you could turn event publishing pipeline off by removing /etc/ceilometer/event_pipeline.yaml, but in pike it now defaults to pipeline/data/event_pipeline.yaml as a fallback location (see https://review.openstack.org/#/c/441734/). It would be great if there was a way to turn off event publishing pipeline via configuration especially since panko and gnocchi might not be deployed (since they are separate components)

[Julien Danjou (jdanjou)]

You can just put an empty event_pipeline.yaml I guess.

But I agree it sucks as it is.

[Ashwin Agate (ashwin-agate)]

Tried using empty event_pipeline.yaml but ceilometer agent notification fails with this error

```
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils [-] Unhandled exception: TypeError: argument of type 'NoneType' is not iterable
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils Traceback (most recent call last):
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils File "/usr/lib/python2.7/site-packages/cotyledon/_utils.py", line 50, in exit_on_exception
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils yield
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils File "/usr/lib/python2.7/site-packages/cotyledon/_service.py", line 133, in _run
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils self.run()
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils File "/usr/lib/python2.7/site-packages/ceilometer/notification.py", line 188, in run
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils self.event_pipeline_manager = pipeline.setup_event_pipeline(self.conf)
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils File "/usr/lib/python2.7/site-packages/ceilometer/pipeline.py", line 893, in setup_event_pipeline
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils EVENT_TYPE)
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils File "/usr/lib/python2.7/site-packages/ceilometer/pipeline.py", line 781, in __init__
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils if not ('sources' in cfg and 'sinks' in cfg):
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils TypeError: argument of type 'NoneType' is not iterable
2017-10-02 23:15:10.979 29652 ERROR cotyledon._utils
```

Workaround that Gordon suggested in IRC of setting source to "!*" does work

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/517715

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/517309
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=2d67bd21dd334f35af6d7a1e1cf2f4dfd06d06fd
Submitter: Zuul
Branch: master

commit 2d67bd21dd334f35af6d7a1e1cf2f4dfd06d06fd
Author: gord chung <email address hidden>
Date: Wed Nov 1 22:00:08 2017 +0000

    nearly pluggable notification agent

    notification agent now just asks for pipelinemanagers and gets
    endpoints it should broadcast to from there. it only sets up a
    listener for main queue and a listener for internal queue
    (if applicable)

    - pass in publishing/processing context into endpoints instead of
    manager. context is based on partitioning or not
    - move all endpoint/notifier setup to respective pipeline managers
    - change interim broadcast filtering to use event_type rather than
    publisher_id so all filtering uses event_type.
    - add namespace to load supported pipeline managers
    - remove some notification tests as they are redundant and only
    different that it mocks stuff other tests don't mock
    - change relevant_endpoint test to verify endpoints cover all pipelines

    Related-Bug: #1720021
    Change-Id: I9f9073e3b15c4e3a502976c2e3e0306bc99282d9

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/517715
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=60d9b87a808c75c1cd111a7fc788f58e07b34e99
Submitter: Zuul
Branch: master

commit 60d9b87a808c75c1cd111a7fc788f58e07b34e99
Author: gord chung <email address hidden>
Date: Fri Nov 3 20:01:02 2017 +0000

    pluggable notification agent

    event, meter (and any other custom pipeline) can be enabled/disabled
    by setting `pipelines` option under [notification] agent

    Change-Id: Ia21256d0308457d077836e27b45d2acb8bb697e4
    Closes-Bug: #1720021

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/ceilometer 10.0.0 release.