Bug 2080040

Summary:	[RFE][RHOSP 18.0] Implement Prometheus-native scrape endpoint in Ceilometer notification agent
Product:	Red Hat OpenStack	Reporter:	Leif Madsen <lmadsen>
Component:	openstack-ceilometer	Assignee:	Jaromír Wysoglad <jwysogla>
Status:	POST ---	QA Contact:	Leonid Natapov <lnatapov>
Severity:	medium	Docs Contact:	mgeary <mgeary>
Priority:	urgent
Version:	18.0 (Zed)	CC:	apevec, mrunge, scohen
Target Milestone:	Alpha	Keywords:	FutureFeature, Triaged
Target Release:	18.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:
Clones:	2114652 2130876 (view as bug list)		Environment:
Last Closed:		Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2084206, 2114652, 2130876

Description Leif Madsen 2022-04-28 19:31:17 UTC

Description of problem: It is not possible to scrape Ceilometer with Prometheus to gather metrics data. The existing prometheus publisher in Ceilometer is actually a wrapper on the HTTP publisher to push information to the pushgateway.

Unfortunately there are issues with this approach (as documented in the investigation spike STF-972). Metrics overwrite each other regardless of differing labels, making the pushgateway scenario non-viable.

This epic covers the work required to result in a plugin to Ceilometer that provides a native scrape endpoing for Prometheus to connect to as part of the ceilometer_notification_agent.

Version-Release number of selected component (if applicable): RHOSP 18.0