Bug 1042280

Summary:	[RFE][ceilometer]: Provide a wider range of aggregate functions
Product:	Red Hat OpenStack	Reporter:	RHOS Integration <rhos-integ>
Component:	openstack-ceilometer	Assignee:	RHOS Maint <rhos-maint>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	unspecified	CC:	acathrow, jruzicka, markmc, pbrady, yeylon
Target Milestone:	ga	Keywords:	FutureFeature
Target Release:	5.0 (RHEL 7)
Hardware:	Unspecified
OS:	Unspecified
URL:	https://blueprints.launchpad.net/ceilometer/+spec/wider-aggregate-range
Whiteboard:	upstream_milestone_icehouse-3 upstream_status_implemented upstream_definition_approved
Fixed In Version:		Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description RHOS Integration 2013-12-12 21:37:41 UTC

Cloned from launchpad blueprint https://blueprints.launchpad.net/ceilometer/+spec/wider-aggregate-range.

Description:

Currently, we support a limited range of aggregate functions aggregation functions: avg, sum, min, max, count.

This range should be extended to support a wider range of statistical aggregates, adding for example:

* standard deviation
* rate of change
* moving-window averages
* percentile of various ranks, e.g. p99 for API responsiveness

It would also be useful to support a capabilities-style operation to allow caller discover the available aggregation functions.
(Especially since aggregates might be specific to individual storage-drivers, e.g. where some aggregate can be very efficiently calculated via mongodb MapReduce, but prohibitively expensive for say sqlalchemy).

Specification URL (additional information):

None