hanahmily commented on a change in pull request #6608:
URL: https://github.com/apache/skywalking/pull/6608#discussion_r600196848
##########
File path: docs/en/concepts-and-designs/mal.md
##########
@@ -57,6 +57,25 @@ For example, this filters all instance_trace_count samples
for values >= 33:
```
instance_trace_count.valueGreaterEqual(33)
```
+### K8s
+MAL support add specific Labels to the samples that collect from K8s metrics
collectors.
+This feature need OAP Server has the authority to access the K8s's `API
Server`.
+
+#### k8sTagServiceByPodName
+`k8sTagServiceByPodName(podName,serviceName)`. Add a sevice Label to the
sample that already has a pod name.
+
+For example:
+```
+container_cpu_usage_seconds_total{container=my-nginx, cpu=total,
pod=my-nginx-5dc4865748-mbczh} 2
+```
+Expression:
+```
+container_cpu_usage_seconds_total.k8sTagServiceByPodName('pod' , 'service')
+```
+Output:
+```
+container_cpu_usage_seconds_total{container=my-nginx, cpu=total,
pod=my-nginx-5dc4865748-mbczh, service='default:nginx-service'} 2
Review comment:
*svc*.*namespace* is the canonical format for a service, for example,
`nginx-service.default`
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