Add a new metrics to indicates the the current queue length.

[whalecold]

Should we add a metrics named controller_runtime_queue_length to indicates the length of the queue in the controller. Some times the Reconcile has not been invoked, i want to know if the queue is emtpy.

[FillZpp]

You should use workqueue_depth, which is the current depth of workqueue. Here are some metrics for workqueue: https://github.com/kubernetes-sigs/controller-runtime/blob/master/pkg/metrics/workqueue.go#L41

[Somefive]

Will there be any conflict between

controller-runtime/pkg/metrics/workqueue.go

Line 99 in 7399a3a

workqueue.SetProvider(workqueueMetricsProvider{})

and https://github.com/kubernetes/component-base/blob/03d57670a9cda43def5d9c960823d6d4558e99ff/metrics/prometheus/workqueue/metrics.go#L101?

Both repository try to set the Provider but only the earliest will take effect. In the case where component-base library is initialized first, the workqueue_depth metrics in component-base will be used and the metrics in controller-runtime will not work. It will cause the default exposed metrics in controller-runtime to be unable to show the workflow_depth number.

Is there any hint or recommendation for handling that?

[FillZpp]

@Somefive k/component-base is synced from k/k/staging/src/k8s.io/component-base and mostly for those core components of Kubernetes, such as KCM, kube-scheduler, which will not import controller-runtime.

On the other hand, most custom Operators based on controller-runtime probably don't have to rely on component-base. But if they are both imported by a project, you will find they all register to workqueue.SetProvider. So why do you need the component-base?

[Somefive]

@Somefive k/component-base is synced from k/k/staging/src/k8s.io/component-base and mostly for those core components of Kubernetes, such as KCM, kube-scheduler, which will not import controller-runtime.

On the other hand, most custom Operators based on controller-runtime probably don't have to rely on component-base. But if they are both imported by a project, you will find they all register to workqueue.SetProvider. So why do you need the component-base?

The component-base library might not be directly depended. However, other libraries like k8s.io/apiextensions-apiserver, sigs.k8s.io/controller-runtime, github.com/coreos/prometheus-operator, and many others depends on that. If the codes in these libraries call component-base functions, the initialization function in component-base will work and might call workqueue.SetProvider before controller-runtime, which will prevent the later controller-runtime from setting its own workqueue_depth metrics.

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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[RainbowMango]

/reopen

As mentioned by @Somefive, the issue indeed exists and has not yet been resolved.

[k8s-ci-robot]

@RainbowMango: Reopened this issue.

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/reopen

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[k8s-triage-robot]

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close not-planned

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