Added documentation.

- How to build a Windows Installer package.
- How to set up monitoring with prometheus and graphana.

docs/monitoring/README.md

@@ -0,0 +1,36 @@
+# Setting up monitoring.
+
+To set up monitoring for Velociraptor servers you will need to install
+both Graphana and Prometheus.
+
+## Setting up Prometheus
+
+Prometheus will scrape the Velociraptor server monitoring port and
+record time series of critical server state. You can use the provided
+prometheus.yaml file without change and launch prometheus like this:
+
+```
+$ prometheus  --config.file velociraptor.yml
+```
+
+## Setting up Graphana
+
+Graphana is a graphing package which helps to visualize the Prometheus
+data. Graphana is very easy to use and can be configured using its web
+interface.
+
+First add Prometheus as a data source.
+
+You can import the graphana.json file as a new dashboard. This is a
+good starting point for a useful monitoring dashboard and will show
+the following graphs:
+
+1. Flow completion rate in flows/second - this gives an indication of
+   active hunts and how busy the server is.
+
+2. Client current connections - shows how many clients are currently
+   connected to the server.
+
+3. Resident memory size - shows how much memory the server is using.
+
+4. CPU Load - shows how much cpu the server is currently using.