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Merge pull request #3691 from Kavinjsir/docs/update-metrics-reference
📖 Update metrics reference to the latest version
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‎docs/book/src/reference/metrics-reference.md

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Following the metrics which are exported and provided by [controller-runtime](https://github.com/kubernetes-sigs/controller-runtime) by default:
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| Metrics name | Type | Description |
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| ------------------------------------------------------------------------------------------------------------------------------------------------------------------ | :-------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| [workqueue_depth](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/metrics/workqueue.go#L41) | Gauge | Current depth of workqueue. |
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| [workqueue_adds_total](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/metrics/workqueue.go#L47) | Counter | Total number of adds handled by workqueue. |
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| [workqueue_queue_duration_seconds](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/metrics/workqueue.go#L53) | Histogram | How long in seconds an item stays in workqueue before being requested. |
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| [workqueue_work_duration_seconds](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/metrics/workqueue.go#L60) | Histogram | How long in seconds processing an item from workqueue takes. |
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| [workqueue_unfinished_work_seconds](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/metrics/workqueue.go#L67) | Gauge | How many seconds of work has been done that is in progress and hasn't been observed by work_duration. Large values indicate stuck threads. One can deduce the number of stuck threads by observing the rate at which this increases. |
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| [workqueue_longest_running_processor_seconds](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/metrics/workqueue.go#L76) | Gauge | How many seconds has the longest running processor for workqueue been running. |
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| [workqueue_retries_total](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/metrics/workqueue.go#L83) | Counter | Total number of retries handled by workqueue. |
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| [rest_client_requests_total ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/metrics/client_go_adapter.go#L79) | Counter | Number of HTTP requests, partitioned by status code, method, and host. |
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| [controller_runtime_reconcile_total ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/internal/controller/metrics/metrics.go#L30) | Counter | Total number of reconciliations per controller. |
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| [controller_runtime_reconcile_errors_total ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/internal/controller/metrics/metrics.go#L37) | Counter | Total number of reconciliation errors per controller. |
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| [controller_runtime_reconcile_time_seconds ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/internal/controller/metrics/metrics.go#L44) | Histogram | Length of time per reconciliation per controller. |
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| [controller_runtime_max_concurrent_reconciles ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/internal/controller/metrics/metrics.go#L53) | Gauge | Maximum number of concurrent reconciles per controller. |
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| [controller_runtime_active_workers ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/internal/controller/metrics/metrics.go#L60) | Gauge | Number of currently used workers per controller. |
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| [controller_runtime_webhook_latency_seconds ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/webhook/internal/metrics/metrics.go#L31) | Histogram | Histogram of the latency of processing admission requests. |
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| [controller_runtime_webhook_requests_total ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/webhook/internal/metrics/metrics.go#L40) | Counter | Total number of admission requests by HTTP status code. |
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| [controller_runtime_webhook_requests_in_flight](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/webhook/internal/metrics/metrics.go#L51) | Gauge | Current number of admission requests being served. |
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| Metrics name | Type | Description |
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| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | :-------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| [workqueue_depth](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/metrics/workqueue.go#L41) | Gauge | Current depth of workqueue. |
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| [workqueue_adds_total](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/metrics/workqueue.go#L47) | Counter | Total number of adds handled by workqueue. |
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| [workqueue_queue_duration_seconds](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/metrics/workqueue.go#L53) | Histogram | How long in seconds an item stays in workqueue before being requested. |
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| [workqueue_work_duration_seconds](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/metrics/workqueue.go#L60) | Histogram | How long in seconds processing an item from workqueue takes. |
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| [workqueue_unfinished_work_seconds](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/metrics/workqueue.go#L67) | Gauge | How many seconds of work has been done that is in progress and hasn't been observed by work_duration. Large values indicate stuck threads. One can deduce the number of stuck threads by observing the rate at which this increases. |
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| [workqueue_longest_running_processor_seconds](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/metrics/workqueue.go#L76) | Gauge | How many seconds has the longest running processor for workqueue been running. |
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| [workqueue_retries_total](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/metrics/workqueue.go#L83) | Counter | Total number of retries handled by workqueue. |
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| [rest_client_requests_total ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/metrics/client_go_adapter.go#L33) | Counter | Number of HTTP requests, partitioned by status code, method, and host. |
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| [controller_runtime_reconcile_total ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/internal/controller/metrics/metrics.go#L30) | Counter | Total number of reconciliations per controller. |
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| [controller_runtime_reconcile_errors_total ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/internal/controller/metrics/metrics.go#L37) | Counter | Total number of reconciliation errors per controller. |
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| [controller_runtime_terminal_reconcile_errors_total ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/internal/controller/metrics/metrics.go#L44) | Counter | Total number of terminal errors from the reconciler. |
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| [controller_runtime_reconcile_time_seconds ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/internal/controller/metrics/metrics.go#L51) | Histogram | Length of time per reconciliation per controller. |
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| [controller_runtime_max_concurrent_reconciles ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/internal/controller/metrics/metrics.go#L60) | Gauge | Maximum number of concurrent reconciles per controller. |
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| [controller_runtime_active_workers ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/internal/controller/metrics/metrics.go#L67) | Gauge | Number of currently used workers per controller. |
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| [controller_runtime_webhook_latency_seconds ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/webhook/internal/metrics/metrics.go#L31) | Histogram | Histogram of the latency of processing admission requests. |
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| [controller_runtime_webhook_requests_total ](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/webhook/internal/metrics/metrics.go#L40) | Counter | Total number of admission requests by HTTP status code. |
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| [controller_runtime_webhook_requests_in_flight](https://github.com/kubernetes-sigs/controller-runtime/blob/v0.16.3/pkg/webhook/internal/metrics/metrics.go#L51) | Gauge | Current number of admission requests being served. |

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