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Hello, Ceilometer Team,

For now, the results listing meters are not grouped, even we can filter the
results by resource_id, project_id or meter_name, but I don't think this is
a good way to group the meters.

See an example:

suo at ustack:~/devstack$ ceilometer meter-list
+----------------------------+-------+-----------+--------------------------------------+---------+----------------------------------+
| Name                       | Type  | Unit      | Resource
ID                          | User ID | Project ID                       |
+----------------------------+-------+-----------+--------------------------------------+---------+----------------------------------+
| image                      | gauge | image     |
3e43b8f4-b347-42a4-b189-931fff9538f3 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image                      | gauge | image     |
838f5bce-ce46-4241-88ba-d6bd1c267bf8 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image                      | gauge | image     |
b5fbf186-02fa-4279-a918-d71e6abd7020 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image.size                 | gauge | B         |
3e43b8f4-b347-42a4-b189-931fff9538f3 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image.size                 | gauge | B         |
838f5bce-ce46-4241-88ba-d6bd1c267bf8 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image.size                 | gauge | B         |
b5fbf186-02fa-4279-a918-d71e6abd7020 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image.update               | delta | image     |
3e43b8f4-b347-42a4-b189-931fff9538f3 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image.update               | delta | image     |
838f5bce-ce46-4241-88ba-d6bd1c267bf8 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image.update               | delta | image     |
b5fbf186-02fa-4279-a918-d71e6abd7020 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image.upload               | delta | image     |
3e43b8f4-b347-42a4-b189-931fff9538f3 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image.upload               | delta | image     |
838f5bce-ce46-4241-88ba-d6bd1c267bf8 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| image.upload               | delta | image     |
b5fbf186-02fa-4279-a918-d71e6abd7020 | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| storage.objects            | gauge | object    |
27ffe3121d4b49c19ebb51548ee7ea88     | None    |
27ffe3121d4b49c19ebb51548ee7ea88 |
| storage.objects            | gauge | object    |
2dc999e8e61e43748d3eb5c02b878fe1     | None    |
2dc999e8e61e43748d3eb5c02b878fe1 |
| storage.objects            | gauge | object    |
421212a8b3cb43da9eeae077f59c4e40     | None    |
421212a8b3cb43da9eeae077f59c4e40 |
......
| storage.objects.size       | gauge | B         |
4a0d19f2e025447ea8567a0ccaf2f74a     | None    |
4a0d19f2e025447ea8567a0ccaf2f74a |
| storage.objects.size       | gauge | B         |
61e13fab30f9493b814321e6684936a4     | None    |
61e13fab30f9493b814321e6684936a4 |
| storage.objects.size       | gauge | B         |
b03b0bfc3ccb4dd98d4ad03c6d32e1be     | None    |
b03b0bfc3ccb4dd98d4ad03c6d32e1be |
| storage.objects.size       | gauge | B         |
f22454605f2d498fad0b2b5520fba349     | None    |
f22454605f2d498fad0b2b5520fba349 |
+----------------------------+-------+-----------+--------------------------------------+---------+----------------------------------+

I think this result will confuse users more or little, which meters come
from compute service, and which meters come from network service, or can I
get all the meters coming from storage service ?  So I think the grouping
by services will make users more clear about what they have got, and it is
also usefull to display them on dashboard.

In addition, there is a glossary named 'source' in ceilometer, but I don't
think that is the same thing with grouping. So if we can add a field named
service/group/namespace to the meter table, that will make the whole world
clear.

Any ideas ?
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