Ceilometer doesnt expose a way to retrieve just a distinct list of active meter names

[Rohit Jaiswal]

Horizon has the resource usage pane. The stats tab on that pane has a dropdown - Metric which gets its data from the Ceilometer meter-list API, however, this API returns meter information (with project and resource info) that is not unique and repetitive based on which meter has more data points (samples) with most recent timestamps.

By default meter-list will also limit the size of resultset to 100 so there is no guarantee that the first 100 will contain all the meter names from the backend. Increasing the limit risks timeout by client, in this case Horizon pane exhibits a hang.

There should a different API to retrieve just the distinct set of meter names, for which there is at least one sample in the sample table. This APi can be consumed by Horizon and other users who just want to know the unique set of meters in the system.

[gordon chung (chungg)]

adding this to horizon+ceilometer discussion

[Rohit Jaiswal (rohit-jaiswal-3)]

Is adding a new get_distinct_meters API to the v2 api an option to consider? this would have to be supported by all backends.. just curious since v2 is in maintenance mode, but the horizon issue is still there..

[Rohit Jaiswal (rohit-jaiswal-3)]

A possible option is to pass in an optional flag, distinct to the get_meters API to get a distinct set of meter names..

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/259626

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/259626
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=52f48485eeed50dfa4705fc73e278214eb9a7f00
Submitter: Jenkins
Branch: master

commit 52f48485eeed50dfa4705fc73e278214eb9a7f00
Author: Rohit Jaiswal <email address hidden>
Date: Fri Dec 18 12:56:59 2015 -0800

    Enhances get_meters to return unique meters

    Enhances get_meters in the storage layer
    and API to accept a unique flag and return
    back a list of unique meters for clients like
    Horizon to consume.

    DocImpact
    Change-Id: Ifdcb907df867ae650eae733bc7b635a283939064
    Closes-Bug: 1506959

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/liberty
Review: https://review.openstack.org/274185

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/272633
Committed: https://git.openstack.org/cgit/openstack/python-ceilometerclient/commit/?id=c45000c7594ad6fbfabf44c0615dce3021f43605
Submitter: Jenkins
Branch: master

commit c45000c7594ad6fbfabf44c0615dce3021f43605
Author: Rohit Jaiswal <email address hidden>
Date: Tue Jan 26 08:36:43 2016 -0800

    Enhances client to support unique meter retrieval

    meter list API is enhanced to support a unique param
    If specified as True, it returns a unique list of
    meters.

    This patch enhances the ceilometer-client to support
    the unique argument in the shell and the client bindings.

    DocImpact
    Closes-Bug: #1506959

    Change-Id: I011ca725c25e1cdbe9891c3719f13f5cd34142ea

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/ceilometer 6.0.0.0b3 development milestone.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/291832

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/291832
Committed: https://git.openstack.org/cgit/openstack/python-ceilometerclient/commit/?id=cb98c6d05fadb4f9df202235a9d8582f5ed40339
Submitter: Jenkins
Branch: stable/mitaka

commit cb98c6d05fadb4f9df202235a9d8582f5ed40339
Author: Rohit Jaiswal <email address hidden>
Date: Tue Jan 26 08:36:43 2016 -0800

    Enhances client to support unique meter retrieval

    meter list API is enhanced to support a unique param
    If specified as True, it returns a unique list of
    meters.

    This patch enhances the ceilometer-client to support
    the unique argument in the shell and the client bindings.

    DocImpact
    Closes-Bug: #1506959

    Change-Id: I011ca725c25e1cdbe9891c3719f13f5cd34142ea
    (cherry picked from commit c45000c7594ad6fbfabf44c0615dce3021f43605)

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/python-ceilometerclient 2.4.0 release.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Matt Riedemann (<email address hidden>) on branch: stable/liberty
Review: https://review.openstack.org/274185

[Davanum Srinivas (DIMS) (dims-v)]

This issue was fixed in the openstack/python-ceilometerclient 2.5.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-ceilometerclient 2.4.0 release.