[zh-cn] sync with PR 51750

Author: dkarczmarski

content/zh-cn/docs/concepts/cluster-administration/system-metrics.md

@@ -443,11 +443,11 @@ is encountered that is not allowed with respect to the allow-list constraints.
 ## {{% heading "whatsnext" %}}
 
 <!--
-* Read about the [Prometheus text format](https://github.com/prometheus/docs/blob/master/content/docs/instrumenting/exposition_formats.md#text-based-format)
+* Read about the [Prometheus text format](https://github.com/prometheus/docs/blob/main/docs/instrumenting/exposition_formats.md#text-based-format)
   for metrics
 * See the list of [stable Kubernetes metrics](https://github.com/kubernetes/kubernetes/blob/master/test/instrumentation/testdata/stable-metrics-list.yaml)
 * Read about the [Kubernetes deprecation policy](/docs/reference/using-api/deprecation-policy/#deprecating-a-feature-or-behavior)
 -->
-* 阅读有关指标的 [Prometheus 文本格式](https://github.com/prometheus/docs/blob/master/content/docs/instrumenting/exposition_formats.md#text-based-format)
+* 阅读有关指标的 [Prometheus 文本格式](https://github.com/prometheus/docs/blob/main/docs/instrumenting/exposition_formats.md#text-based-format)
 * 参阅[稳定的 Kubernetes 指标](https://github.com/kubernetes/kubernetes/blob/master/test/instrumentation/testdata/stable-metrics-list.yaml)的列表
 * 阅读有关 [Kubernetes 弃用策略](/zh-cn/docs/reference/using-api/deprecation-policy/#deprecating-a-feature-or-behavior)