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| saska | Hi, does anybody know whether is it possible for Monasca to collect metrics mentioned in the following link? https://opendev.org/openstack/watcher/src/branch/master/watcher/decision_engine/datasources/monasca.py#L31 If it is not possible, what is missing in Monasca's code (or architecture) which would make it possible? | 09:20 |
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| witek_ | saska: some of these metrics are available via native Monasca checks | 09:25 |
| witek_ | https://github.com/openstack/monasca-agent/blob/master/docs/Plugins.md#agent-plugin-detail | 09:26 |
| witek_ | https://github.com/openstack/monasca-agent/blob/master/docs/Libvirt.md#per-instance-metrics | 09:26 |
| witek_ | alternatively you can collect any Ceilometer or Prometheus measurements | 09:27 |
| saska | witek_ : thank you. In the "per instance metrics" section I noticed 2 which may be helpful. mem.free_perc which is described as " Percent of memory free" and mem.resident_gb which is described as "Total memory used on host, an Operations-only metric ". Does the first one refer to 1 VM (per instance== 1 VM)? What does it mean "operations-only metrics"? | 09:51 |
| witek_ | saska: yes, instance = VM, this document describes the libvirt plugin | 09:59 |
| witek_ | this plugin provides two sets of measurements, one for the operator (operator project) and one for the tenant | 10:00 |
| witek_ | mem.resident_mb is available only in operator project | 10:01 |
| witek_ | please also see this section https://github.com/openstack/monasca-agent/blob/master/docs/Libvirt.md#untunable-metrics | 10:02 |
| saska | witek_ : thank you. The last link shows that for an administrator, metrics are collected per instance (in libvirt plugin) and for a user per tenant. And the vm.mem.resident_mb is available only for open stack operator since a user (owner of a tenant) does not need to know how many gb of memory does his project occupy on a host. Is that right? | 10:38 |
| witek_ | exactly | 10:38 |
| *** witek_ is now known as witek | 10:38 | |
| saska | witek_ : thank you. I appreciate your help. | 10:51 |
| witek | saska: you're welcome, don't hesitate to ask more | 10:54 |
| saska | witek: Thank you. I have many, but trying to figure out some of them on my own. What is the difference between vm.mem.total_mb and vm.mem.resident_mb? Is it possible, that a VM has allocated memory on more than 1 host? | 11:25 |
| witek | here is libvirt documentation describing these values: https://www.libvirt.org/html/libvirt-libvirt-domain.html#virDomainMemoryStatTags | 11:34 |
| witek | mem.total_gb - AVAILABLE | 11:34 |
| witek | mem.resident_db - RSS | 11:35 |
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