Update cheatsheets

etcd

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# etcd
+
+> A distributed, reliable key-value store for the most critical data of a distributed system.
+> More information: <https://etcd.io>.
+
+- Start a single-node etcd cluster:
+
+`etcd`
+
+- Start a single-node etcd cluster, listening for client requests on a custom URL:
+
+`etcd --advertise-client-urls {{http://127.0.0.1:1234}} --listen-client-urls {{http://127.0.0.1:1234}}`
+
+- Start a single-node etcd cluster with a custom name:
+
+`etcd --name {{my_etcd_cluster}}`
+
+- Start a single-node etcd cluster with extensive metrics available at <http://localhost:2379/debug/pprof/>:
+
+`etcd --enable-pprof --metrics extensive`