Merge branch 'edge' of https://github.com/radius-project/docs into edge

docs/content/guides/operations/control-plane/observability/metrics/overview/index.md

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+---
+type: docs
+title: "Overview: Control plane metrics"
+linkTitle: "Overview"
+weight: 200
+description: "Learn about Radius control plane metrics"
+categories: ["Overview"]
+---
+
+Radius emits metrics from the control-plane which can be used for troubleshooting and monitoring.
+
+## Available metrics
+
+Refer to the [metrics reference]({{< ref "/reference/metrics" >}}) for a list of available metrics.

docs/content/reference/metrics.md

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+---
+type: docs
+title: "Reference: Available Radius metrics"
+linkTitle: "Metrics"
+weight: 850
+description: "Learn what metrics are available for the Radius control plane"
+categories: ["Reference"]
+---
+
+Radius currently records following custom metrics that provide insight into its health and operations:
+
+  * [Radius async operation metrics](#async-operation-metrics)
+  * [Radius recipe metrics](#recipe-metrics)
+
+In addition, Radius uses otelhttp meter provider. Therefore all of the HTTP metrics documented at [otelhttp metrics](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/semantic_conventions/http-metrics.md) are also available.
+
+## Async operation metrics
+
+| Metrics Name | Description |
+|--------------|-------------|
+|`asyncoperation.operation`          | Total async operation count
+|`asyncoperation.queued.operation`   | Number of queued async operation
+|`asyncoperation.extended.operation` | Number of extended async operation that are extended
+|`asyncoperation.duration`           | Async operation duration in milliseconds
+
+## Recipe Engine metrics
+
+| Metrics Name | Description |
+|--------------|-------------|
+| `recipe.operation.duration`       | Recipe engine operation duration in milliseconds
+| `recipe.download.duration`        | Recipe download duration in milliseconds
+| `recipe.tf.installation.duration` | Terraform installation duration in milliseconds
+| `recipe.tf.init.duration`         | Terraform initialization duration