Example of query for total traffic (sum all servers in a site with In/Out traffic):
  # prometheus.XX.mycompany1.co.uk:9090 from Cam
  sum(irate(node_netstat_IpExt_InOctets{instance=~"^.*nj\\.mycompany1\\.co\\.uk"}[5m]) + irate(node_netstat_IpExt_OutOctets{instance=~"^.*nj\\.mycompany1\\.co\\.uk"}[5m]))*8/1000000000
  
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  * Exporter (in the server/device to be monitored). Metrics are pulled (scraped) from exporters
    * node exporter (linux box)
    * snmp exporter (really anything)
  * Dashboard
    * Grafana
  * Alert
    * YAML configuration for prometheus

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''cardinality'' in lables (?)
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prometheus stores its data in a time series database