Add Prometheus metrics to readiness condition reporter by rawadhossain · Pull Request #379 · kubernetes-sigs/node-readiness-controller

rawadhossain · 2026-08-09T10:59:27Z

Description

Implements the Reporter metrics specified in the observability design

node_readiness_reporter_build_info
node_readiness_reporter_check_duration_seconds
node_readiness_reporter_checks_total
node_readiness_reporter_condition_writes_total

Also adds the Prometheus /metrics and /healthz endpoints to the readiness condition reporter.

Implementation choices

Single HTTP server for both /metrics and /healthz to keep the Reporter to one listener and port.
Dedicated Prometheus registry to keep the Reporter's metrics isolated and avoid registration conflicts in tests, following the same general pattern used by the controller metrics.
Port :9445 as the default metrics port because the Reporter runs with hostNetwork: true. The address is configurable through METRICS_BIND_ADDRESS.

Build fix

Updated Dockerfile.reporter to build the Reporter package instead of single file main.go, since the new metrics.go also needs to be included.

Fixes #380

Type of Change

/kind feature

Testing

Verified metrics scraping with a live kind cluster and Prometheus.
Verified graceful SIGTERM shutdown.
Verified the Reporter continues its normal check/condition-update loop when the metrics port is unavailable.

Checklist

make test passes
make lint passes

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kubernetes-prow · 2026-08-09T10:59:38Z

Hi @rawadhossain. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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ajaysundark · 2026-08-09T16:15:26Z

/cc @AvineshTripathi @ajaysundark

ajaysundark · 2026-08-10T02:38:27Z

/ok-to-test

AvineshTripathi

Thank you for starting this PR! I have left some comments

AvineshTripathi · 2026-08-10T19:58:11Z

+	// reporterChecksTotal tracks total probe check results over time.
+	reporterChecksTotal = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "node_readiness_reporter_checks_total",


node_readiness_reporter_checks instead

but I see in #344 it says node_readiness_reporter_checks_total

Yeah, was confused about this too, so kept it as in the design doc.

I followed https://prometheus.io/docs/practices/naming/#metric-names. The metrics convention suggests that an accumulating count has total as a suffix. Also on a similar note, https://www.robustperception.io/on-the-naming-of-things/ was a good read on why our node_readiness_rules_total (a gauge) metric could drop the suffix as can cause to confusions like this.

Signed-off-by: Rawad Hossain <rawad.hossain00@gmail.com>

AvineshTripathi · 2026-08-17T19:31:02Z

/lgtm

I think this is all good now. @ajaysundark can you take a final look

ajaysundark · 2026-08-18T06:50:47Z

/lgtm

please address the comments when you get time before we could merge this.

AvineshTripathi · 2026-08-18T15:32:09Z

/lgtm

Adding it again! Changes looks good

ajaysundark · 2026-08-18T22:31:56Z

/approve

kubernetes-prow · 2026-08-18T22:32:07Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ajaysundark, rawadhossain

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kubernetes-prow Bot added the kind/feature Categorizes issue or PR as related to a new feature. label Aug 9, 2026

kubernetes-prow Bot requested review from dchen1107 and mrunalp August 9, 2026 10:59

kubernetes-prow Bot added needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Aug 9, 2026

kubernetes-prow Bot added the size/L Denotes a PR that changes 100-499 lines, ignoring generated files. label Aug 9, 2026

kubernetes-prow Bot requested review from AvineshTripathi and ajaysundark August 9, 2026 16:15

Ayush4958 mentioned this pull request Aug 9, 2026

Clear FailedNodes on successful node reconciliation #381

Merged

2 tasks

kubernetes-prow Bot added ok-to-test Indicates a non-member PR verified by an org member that is safe to test. and removed needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. labels Aug 10, 2026

AvineshTripathi reviewed Aug 10, 2026

View reviewed changes

add Prometheus metrics

b5cce66

Signed-off-by: Rawad Hossain <rawad.hossain00@gmail.com>

rawadhossain force-pushed the reporter branch from 95e009f to b5cce66 Compare August 11, 2026 03:40

tejassinghbhati mentioned this pull request Aug 13, 2026

fix: stop the chart suggesting an empty nodeSelector #404

Merged

2 tasks

ajaysundark reviewed Aug 14, 2026

View reviewed changes

Comment thread cmd/readiness-condition-reporter/metrics.go

rawadhossain added 2 commits August 14, 2026 10:02

add node_readiness_build_info metric

10fa1a0

Signed-off-by: Rawad Hossain <rawad.hossain00@gmail.com>

Merge branch 'main' into reporter

2e35f85

rawadhossain force-pushed the reporter branch 2 times, most recently from 3613030 to 2e35f85 Compare August 14, 2026 23:10

ajaysundark requested review from AvineshTripathi and removed request for dchen1107 and mrunalp August 17, 2026 05:00

kubernetes-prow Bot assigned AvineshTripathi Aug 17, 2026

kubernetes-prow Bot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Aug 17, 2026

rawadhossain mentioned this pull request Aug 17, 2026

Add reporter metrics to examples #419

Merged

2 tasks

ajaysundark reviewed Aug 18, 2026

View reviewed changes

Comment thread cmd/readiness-condition-reporter/metrics.go Outdated

ajaysundark reviewed Aug 18, 2026

View reviewed changes

Comment thread cmd/readiness-condition-reporter/metrics.go Outdated

ajaysundark reviewed Aug 18, 2026

View reviewed changes

Comment thread cmd/readiness-condition-reporter/metrics.go Outdated

kubernetes-prow Bot assigned ajaysundark Aug 18, 2026

reporter metric buckets and descriptions

2de0068

kubernetes-prow Bot removed the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Aug 18, 2026

kubernetes-prow Bot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Aug 18, 2026

kubernetes-prow Bot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Aug 18, 2026

kubernetes-prow Bot merged commit 33bdbc9 into kubernetes-sigs:main Aug 18, 2026
10 checks passed

rawadhossain mentioned this pull request Aug 23, 2026

REQUEST: New membership for rawadhossain kubernetes/org#6576

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Description

Implementation choices

Build fix

Type of Change

Testing

Checklist

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rawadhossain commented Aug 9, 2026 •

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