Service monitoring v0.1 infrastructure

To enable a centralised dashboard view on the local and global services running at the v0.1 SRCNodes, we need a data source containing information from these services.

This will entail information being collected in a central data store and a dashboard (Grafana) to build a meaningful view of SRCNet service monitoring metrics.
There can be several ways of doing this

• In its simplest form, this could be events from services being pushed into a central DB serving as a Prometheus data source that is used to build dashboard views. 
• It could also mean sites running an metrics/events exporter service that is probed by/scraped by the central monitoring service. In either approach (push vs pull, activeMQ, Kafka etc), an initial format for the corresponding events needs to be established.