Update README.md

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@ -138,6 +138,7 @@ WAN - $WAN is a static variable defined so that a separate dashboard panel can b
LAN - $LAN uses a regex to remove any interfaces you don't want to be grouped as LAN. The filtering happens in the "Regex" field. I use a negative lookahead regex to match the interfaces I want excluded. It should be pretty easy to understand what you need to do here. I have excluded igb0 (WAN) and igb1,igb2,igb3 (only used to host vlans).
Lastly, I don't recommend setting the time range beyond 24 hours, due to how many data points that will return in grafana.
## Troubleshooting