Add setup scripts for a Graphite server.

compute_engine_scripts/monitoring/README.md

Index: compute_engine_scripts/monitoring/README.md
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+Monitoring (Graphite)
+=====================
+
+[Graphite](https://graphite.readthedocs.org/en/latest/) is a monitoring tool
+for servers and services. We are using it to monitor the runtime performance
+and behavior of the SkFiddle.com and the new SkPerf services, and maybe other
+services in the future.
+
+This document describes the setup procedure for the Graphite server and the
+process for loading data into the server.
+
+Full Server Setup
+=================
+
+Do once
+-------
+
+    $ ./vm_create_instance.sh
+    $ ./vm_setup_instance.sh
+
+Make sure to 'set daemon 2' in /etc/monit/monitrc so that monit
+runs every 2 seconds.
+
+Do on update
+------------
+
+    $ ./vm_push_update.sh
+
+Notes
+-----
+To SSH into the instance:
+
+    gcutil --project=google.com:skia-buildbots ssh --ssh_user=default skia-monitoring-b
+
+If you need to modify the constants for the vm_XXX.sh scripts they are
+specified in compute_engine_scripts/buildbot/vm_config.sh.