Update cheatsheets

tldr/rabbitmq-diagnostics

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rabbitmq-diagnostics
+
+> Diagnose, monitor, and run health checks on RabbitMQ nodes.
+> Many subcommands are delegated to `rabbitmqctl`.
+> More information: <https://www.rabbitmq.com/docs/man/rabbitmq-diagnostics.8.html>.
+
+- List resource alarms:
+
+`rabbitmq-diagnostics alarms`
+
+- List node certificates:
+
+`rabbitmq-diagnostics certificates`
+
+- Check if RabbitMQ is running on the specified node:
+
+`rabbitmq-diagnostics check_running --node {{node}}`
+
+- Run peer discovery:
+
+`rabbitmq-diagnostics discover_peers`
+
+- List listeners (bound sockets):
+
+`rabbitmq-diagnostics listeners`
+
+- Print the last `n` log lines on the specified node:
+
+`rabbitmq-diagnostics log_tail --number {{n}} --node {{node}}`