stern: add page (#3159)

pages/common/stern.md

@@ -0,0 +1,28 @@
+# stern
+
+> Tail multiple pods and containers from Kubernetes.
+> More information: <https://github.com/wercker/stern/>.
+
+- Tail all pods within a current namespace:
+
+`stern .`
+
+- Tail all pods with a specific status:
+
+`stern . --container-state {{running|waiting|terminated}}`
+
+- Tail all pods that matches a given regular expression:
+
+`stern {{pod_query}}`
+
+- Tail matched pods from all namespaces:
+
+`stern {{pod_query}} --all-namespaces`
+
+- Tail matched pods from 15 minutes ago:
+
+`stern {{pod_query}} --since {{15m}}`
+
+- Tail matched pods with a specific label:
+
+`stern {{pod_query}} --selector {{release=canary}}`