(ws) add subcommands: cobra subscribe, and cobra subscribe to statsd bridge

third_party/statsd-client-cpp/README.md

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+# a client sdk for StatsD, written in C++
+
+## API
+See [header file](src/statsd_client.h) for more api detail.
+
+** Notice: this client is not thread-safe **
+
+## Demo
+### test\_client
+This simple demo shows how the use this client.
+
+### system\_monitor
+This is a daemon for monitoring a Linux system.
+It'll wake up every minute and monitor the following:
+
+* load
+* cpu
+* free memory
+* free swap (disabled)
+* received bytes
+* transmitted bytes
+* procs
+* uptime
+
+The stats sent to statsd will be in "host.MACAddress" namespace.
+
+Usage:
+
+    system_monitor statsd-host interface-to-monitor
+
+e.g.
+
+    `system_monitor 172.16.42.1 eth0`
+