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Hi - I have been using ceilometer in devstack for a while, and what I 
used to be able to do is modify pipeline.yaml to set the polling 
interval for "name: cpu_source" to 60, and then publish it using udp. 
The diff for the changes are below for the Liberty pipeline.yaml:

    /stack at vlab:/etc/ceilometer$ diff pipeline.yaml.bak pipeline.yaml//
    //10c10//
    //<       interval: 600//
    //---//
    //>       interval: 60//
    //53c53//
    //<           - notifier:////
    //---//
    //>           - udp://127.0.0.1:4952//
    /

The desired and net effect of these changes in Juno was the I would get 
cpu_util samples every minute, but cpu meters every 10 minute, in the 
Juno release.

These same changes in Liberty are not having the same effect. I get cpu, 
cpu_util, and cpu.delta every 1 minute. Why are cpu samples arriving 
every minute?

    /stack at lab:~$ ceilometer sample-list -m cpu | head//
    //+--------------------------------------+------+------------+------------+------+----------------------------+//
    //| Resource ID                          | Name | Type       |
    Volume     | Unit | Timestamp                  |//
    //+--------------------------------------+------+------------+------------+------+----------------------------+//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu  | cumulative |
    1.0746e+11 | ns   | 2016-04-08T13:48:17.380281 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu  | cumulative |
    1.0739e+11 | ns   | 2016-04-08T13:47:17.357667 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu  | cumulative |
    1.073e+11  | ns   | 2016-04-08T13:46:17.414188 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu  | cumulative |
    1.0723e+11 | ns   | 2016-04-08T13:45:17.356869 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu  | cumulative |
    1.0715e+11 | ns   | 2016-04-08T13:44:17.357771 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu  | cumulative |
    1.0707e+11 | ns   | 2016-04-08T13:43:17.349820 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu  | cumulative |
    1.0699e+11 | ns   | 2016-04-08T13:42:17.348110 |//
    //
    //stack at lab:~$ ceilometer sample-list -m cpu.delta | head//
    //+--------------------------------------+-----------+-------+-------------+------+----------------------------+//
    //| Resource ID                          | Name      | Type  |
    Volume      | Unit | Timestamp                  |//
    //+--------------------------------------+-----------+-------+-------------+------+----------------------------+//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu.delta | delta |
    70000000.0  | ns   | 2016-04-08T13:48:17.380281 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu.delta | delta |
    90000000.0  | ns   | 2016-04-08T13:47:17.357667 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu.delta | delta |
    70000000.0  | ns   | 2016-04-08T13:46:17.414188 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu.delta | delta |
    80000000.0  | ns   | 2016-04-08T13:45:17.356869 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu.delta | delta |
    80000000.0  | ns   | 2016-04-08T13:44:17.357771 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu.delta | delta |
    80000000.0  | ns   | 2016-04-08T13:43:17.349820 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu.delta | delta |
    80000000.0  | ns   | 2016-04-08T13:42:17.348110 |//
    //
    //stack at lab:~$ ceilometer sample-list -m cpu_util | head//
    //+--------------------------------------+----------+-------+----------------+------+----------------------------+//
    //| Resource ID                          | Name     | Type  |
    Volume         | Unit | Timestamp                  |//
    //+--------------------------------------+----------+-------+----------------+------+----------------------------+//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu_util | gauge |
    0.116622711567 | %    | 2016-04-08T13:48:17.380281 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu_util | gauge |
    0.150141435735 | %    | 2016-04-08T13:47:17.357667 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu_util | gauge |
    0.116555319427 | %    | 2016-04-08T13:46:17.414188 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu_util | gauge |
    0.133335337808 | %    | 2016-04-08T13:45:17.356869 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu_util | gauge |
    0.133315666786 | %    | 2016-04-08T13:44:17.357771 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu_util | gauge |
    0.133329533442 | %    | 2016-04-08T13:43:17.349820 |//
    //| 6c4d5e4c-066e-4e98-b728-caaa66d8bf3b | cpu_util | gauge |
    0.133329311232 | %    | 2016-04-08T13:42:17.348110 |/

Is this a ceilometer bug, or change? Is my understanding of the desired 
effect incorrect?
Thanks,
Reza
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