ISC DHCP Scopes

install dhcpd-pools - http://dhcpd-pools.sourceforge.net/

create a short script...

#!/bin/bash

/usr/local/bin/dhcpd-pools -c /etc/dhcp/dhcpd.conf --format=j > /var/www/html/dhcpd/dhcpd.json

test by hand...

create telegraf config file

[[inputs.http]]

urls = [ "http://dhcp.host.address/dhcpd/dhcpd.json" ]

method = "GET"

timeout = "15s"

data_format = "json"

json_string_fields = ["fields.*"]

name_override = "dhcpd_stats"

once that's all working and tested manually, import the dashboard and update the queries to reflect the urls you're collecting from.

Last step is to add the script you created to the cron of the dhcpd server. I run it once a minute.

note: the gauge is calculated with nested select statements