On Fri, Aug 02 2013, Thomas Maddox wrote: Hi Thomas,
> I've been poking around to get an understanding of what some of these > default meters mean in the course of researching this Glance bug > (https://bugs.launchpad.net/ceilometer/+bug/1201701). I was wondering if > anyone could explain to me what the instance meter is. The unit 'instance' > sort of confuses me when each one of these meters is tied to a single > resource (instance), especially because it looks like a count of all > notifications regarding a particular instance that hit the bus. Here's some > output for one of the instances I spun up: > http://paste.openstack.org/show/42963/. Are you talking about instance:m1.nano like counters? These are old counters we introduce a while back to count directly the number of instances by summing up all these counters. That's something that should now be done via the API -- I'll look into removing them. About the general instance counter, that's just a gauge counter which has always value = 1, counting the number of 'instance' on a particular resource, in this case, the instance itself. So it's just some sort of a heartbeat counting instances. > Another concern I have is I think I > may have found another bug, because I can delete the instance shown in this > paste, and it still has a resource state description of 'scheduling' long > after it's been deleted: http://paste.openstack.org/show/42962/, much like > the Glance issue I'm currently working on. Then you use resource-show, Ceilometer just returns the latest metadata it has about the resource. So this should be equal to the resource_metadata field of the more recent samples it has in this database (hint: you could go and check this out in the db yourself to be sure). Now, 2 options: - the latest sample retrieved by Ceilometer shows differents metadata, so there's a bug in Ceilometer - the latests sample retrieve by Ceilometer shows the same information, so: a. a message arrived late and out of order to Ceilometer, so the resource metadata is oudated -- we can't do much about it b. this is actually what Nova sends to Ceilometer -- much likely a bug in Nova. -- Julien Danjou ;; Free Software hacker ; freelance consultant ;; http://julien.danjou.info
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