wu-sheng commented on a change in pull request #6608:
URL: https://github.com/apache/skywalking/pull/6608#discussion_r601201779
##########
File path: docs/en/concepts-and-designs/mal.md
##########
@@ -57,6 +57,28 @@ 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`.
+#### retagByK8sMeta
+`retagByK8sMeta(newLabelName, K8sRetagType, existingLabelName)`. Add a new
label to the sample family based on an existing label's value. Provide several
internal converting types, including
+- K8sRetagType.Pod2Service
+
+Add a sevice Label to the sample that already has a pod name.
Review comment:
```suggestion
Add a tag to the sample by using `service` as the key,
`$serviceName.$namespace` as the value, by the given value of the tag key,
which represents the name of a pod.
```
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