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2018-11-26 11:28:33 -0500 问了问题 why does the frequency of my gnocchi measurements not match the set granularity

I'm running openstack and am trying to get my gnocchi meters to come through more frequently so that I can run a scaling demo without lots of 5 minute lags. In Gnocchi I have changed the Archive-policy to be a custom policy with granularity set to 30 seconds (I've also tried the following using the existing 'medium' policy and it has the same result)

+---------------------+--------------------------------------------------------+
| Field               | Value                                                  |
+---------------------+--------------------------------------------------------+
| aggregation_methods | std, count, min, max, sum, mean                        |
| back_window         | 0                                                      |
| definition          | - points: 120, granularity: 0:00:30, timespan: 1:00:00 |
| name                | test                                                    |
+---------------------+--------------------------------------------------------+

the cpu_util meter is picking it up correclty

+------------------------------------+-------------------------------------------------------------------+
| Field                              | Value                                                             |
+------------------------------------+-------------------------------------------------------------------+
| archive_policy/aggregation_methods | std, count, min, max, sum, mean                                   |
| archive_policy/back_window         | 0                                                                 |
| archive_policy/definition          | - points: 120, granularity: 0:00:30, timespan: 1:00:00            |
| archive_policy/name                | test                                                               |
| created_by_project_id              | e499d0c2e0fb4a05ac39c3f8c260052b                                  |
| created_by_user_id                 | 21759a51f3834b9bbae49c3ed17a13e4                                  |
| creator                            | 21759a51f3834b9bbae49c3ed17a13e4:e499d0c2e0fb4a05ac39c3f8c260052b |
| id                                 | e5a02f3a-9fbe-4e44-bb91-e1cfe6b86143                              |
| name                               | cpu_util                                                          |
| resource/created_by_project_id     | e499d0c2e0fb4a05ac39c3f8c260052b                                  |
| resource/created_by_user_id        | 21759a51f3834b9bbae49c3ed17a13e4                                  |
| resource/creator                   | 21759a51f3834b9bbae49c3ed17a13e4:e499d0c2e0fb4a05ac39c3f8c260052b |
| resource/ended_at                  | None                                                              |
| resource/id                        | 243b9715-95ba-4532-9728-3e61776e1c29                              |
| resource/original_resource_id      | 243b9715-95ba-4532-9728-3e61776e1c29                              |
| resource/project_id                | 43a7db62d5d54c4590e363868fff49e2                                  |
| resource/revision_end              | None                                                              |
| resource/revision_start            | 2018-08-08T14:05:09.770765+00:00                                  |
| resource/started_at                | 2018-08-08T13:20:45.948842+00:00                                  |
| resource/type                      | instance                                                          |
| resource/user_id                   | 4e5015006b304e7ca57edc5419b42be3                                  |
| unit                               | %                                                                 |
+------------------------------------+-------------------------------------------------------------------+

but the measurements are still only coming out every 5 min

    gnocchi measures show e5a02f3a-9fbe-4e44-bb91-e1cfe6b86143

    +---------------------------+-------------+--------------+

    | timestamp                 | granularity |        value |
    +---------------------------+-------------+--------------+
    | 2018-08-08T13:30:00+00:00 |        30.0 | 0.0400002375 |
    | 2018-08-08T13:35:00+00:00 |        30.0 | 0.0366666763 |
    | 2018-08-08T13:40:00+00:00 |        30.0 | 0.0366667101 |
    | 2018-08-08T13:45:00+00:00 |        30.0 | 0.0399999545 |
    | 2018-08-08T13:50:00+00:00 |        30.0 | 0.0366664861 |
    | 2018-08-08T13:55:00+00:00 |        30.0 | 0.0400000543 |
    | 2018-08-08T14:00:00+00:00 |        30.0 | 0.0366665877 |
    +---------------------------+-------------+--------------+

any ideas what I am missing?