[Bug 1506959] Re: Ceilometer doesnt expose a way to retrieve just a distinct list of active meter names

[Rohit Jaiswal]

** Also affects: ceilometer (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: ceilometer (Ubuntu)

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https://bugs.launchpad.net/bugs/1506959

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

Status in Ceilometer:
  Fix Released
Status in python-ceilometerclient:
  In Progress

Bug description:
  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.

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