Update cheatsheets

stern

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# stern
+
+> Tail multiple pods and containers from Kubernetes.
+> More information: <https://github.com/stern/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}}`