Bug 2014614
| Summary: | Metrics scraping requests should be assigned to exempt priority level | ||
|---|---|---|---|
| Product: | OpenShift Container Platform | Reporter: | Ben Luddy <bluddy> |
| Component: | kube-apiserver | Assignee: | Stefan Schimanski <sttts> |
| Status: | CLOSED ERRATA | QA Contact: | Rahul Gangwar <rgangwar> |
| Severity: | medium | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 4.10 | CC: | aos-bugs, mfojtik, xxia |
| Target Milestone: | --- | ||
| Target Release: | 4.10.0 | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2022-03-12 04:39:16 UTC | 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: | 2014615 | ||
oc get clusterversion
NAME VERSION AVAILABLE PROGRESSING SINCE STATUS
version 4.10.0-0.nightly-2021-10-19-210507 True False 14m Cluster version is 4.10.0-0.nightly-2021-10-19-210507
oc get prioritylevelconfiguration exempt -o=jsonpath="{.metadata.uid}{ '\n' }"
c6370b8b-2f97-4a07-9ca6-448551bc8e3e
oc --as=system:serviceaccount:openshift-monitoring:prometheus-k8s get --raw '/metrics' -v10 2>&1 | grep X-Kubernetes-Pf-Prioritylevel-Uid
I1020 10:15:17.560268 44362 round_trippers.go:454] X-Kubernetes-Pf-Prioritylevel-Uid: c6370b8b-2f97-4a07-9ca6-448551bc8e3e
The /metrics request is assigned to the exempt priority level.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Moderate: OpenShift Container Platform 4.10.3 security update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2022:0056 |
Description of problem: Requests from Prometheus to kube-apiserver's /metrics endpoint aren't exempted from Priority and Fairness. When their assigned priority level (currently workload-high) becomes saturated, rejected metrics requests may result in missing samples. Version-Release number of selected component (if applicable): 4.10 How reproducible: Always Steps to Reproduce: 1. Note the UID of the "exempt" prioritylevel: $ oc get prioritylevelconfiguration exempt -o=jsonpath="{.metadata.uid}{'\n'}" 2. Query the metrics endpoint while impersonating the Prometheus ServiceAccount: $ oc --as=system:serviceaccount:openshift-monitoring:prometheus-k8s get --raw '/metrics' -v10 2>&1 | grep X-Kubernetes-Pf-Prioritylevel-Uid Actual results: The /metrics request isn't assigned to the exempt priority level. $ oc get prioritylevelconfiguration exempt -o=jsonpath="{.metadata.uid}{ '\n' }" afd92c7f-65df-48e3-ac6b-48d0a063cc33 $ oc --as=system:serviceaccount:openshift-monitoring:prometheus-k8s get --raw '/metrics' -v10 2>&1 | grep X-Kubernetes-Pf-Prioritylevel-Uid I1015 11:41:54.224598 163641 round_trippers.go:463] X-Kubernetes-Pf-Prioritylevel-Uid: 00e7fd91-9201-4ee6-8cfd-99fb0d6c0cc3 Expected results: The /metrics request is assigned to the exempt priority level.