Added KES grafana dashboard (#447)

* Added KES grafana dashboard

Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>

* incorporated review comments

Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>

---------

Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>

Author: shtripat

.github/grafana-dashboard.png

@@ -110,7 +110,16 @@ The ciphertext part of the DEK would be stored alongside the encrypted data for
 decryption.
 
 </details>   
-  
+
+## Monitoring
+
+KES servers provide an API endpoint `/v1/metrics` that observability tools, like Prometheus, can scrape.
+Refer to the [monitoring documentation](https://min.io/docs/kes/concepts/monitoring/) for how to setup and capture KES metrics.
+
+For a graphical Grafana dashboard refer to the following [example](examples/grafana/dashboard.json).
+
+![.github/grafana-dashboard.png]  
+
 ## Docs
 
 If you want to learn more about KES checkout our [documentation](https://min.io/docs/kes/).