Doc: Kubelet PSI metrics feature graduates to Beta

Author: roycaihw

content/en/docs/concepts/cluster-administration/system-metrics.md

@@ -179,11 +179,11 @@ flag to expose these alpha stability metrics.
 
 ### kubelet Pressure Stall Information (PSI) metrics
 
-{{< feature-state for_k8s_version="v1.33" state="alpha" >}}
+{{< feature-state for_k8s_version="v1.34" state="beta" >}}
 
-As an alpha feature, Kubernetes lets you configure kubelet to collect Linux kernel
+As a beta feature, Kubernetes lets you configure kubelet to collect Linux kernel
 [Pressure Stall Information](https://docs.kernel.org/accounting/psi.html)
-(PSI) for CPU, memory and IO usage.
+(PSI) for CPU, memory and I/O usage.
 The information is collected at node, pod and container level.
 The metrics are exposed at the `/metrics/cadvisor` endpoint with the following names:
 
@@ -196,8 +196,7 @@ container_pressure_io_stalled_seconds_total
 container_pressure_io_waiting_seconds_total
 ```
 
-You must enable the `KubeletPSI` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/)
-to use this feature. The information is also exposed in the
+This feature is enabled by default, by setting the `KubeletPSI` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/). The information is also exposed in the
 [Summary API](/docs/reference/instrumentation/node-metrics#psi).
 
 #### Requirements

content/en/docs/reference/command-line-tools-reference/feature-gates/KubeletPSI.md

@@ -9,5 +9,9 @@ stages:
   - stage: alpha
     defaultValue: false
     fromVersion: "1.33"
+    toVersion: "1.33"
+  - stage: beta 
+    defaultValue: true
+    fromVersion: "1.34"
 ---
 Enable kubelet to surface Pressure Stall Information (PSI) metrics in the Summary API and Prometheus metrics.

content/en/docs/reference/instrumentation/node-metrics.md

@@ -45,14 +45,13 @@ the kubelet [fetches Pod- and container-level metric data using CRI](/docs/refer
 
 ## Pressure Stall Information (PSI) {#psi}
 
-{{< feature-state for_k8s_version="v1.33" state="alpha" >}}
+{{< feature-state for_k8s_version="v1.34" state="beta" >}}
 
-As an alpha feature, Kubernetes lets you configure kubelet to collect Linux kernel
+As a beta feature, Kubernetes lets you configure kubelet to collect Linux kernel
 [Pressure Stall Information](https://docs.kernel.org/accounting/psi.html)
-(PSI) for CPU, memory and IO usage. The information is collected at node, pod and container level.
+(PSI) for CPU, memory, and I/O usage. The information is collected at node, pod and container level.
 See [Summary API](/docs/reference/config-api/kubelet-stats.v1alpha1/) for detailed schema.
-You must enable the `KubeletPSI` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/)
-to use this feature. The information is also exposed in
+This feature is enabled by default, by setting the `KubeletPSI` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/). The information is also exposed in
 [Prometheus metrics](/docs/concepts/cluster-administration/system-metrics#psi-metrics).
 
 ### Requirements