Hi all, could someone verify i did this right please, my item is passing temp data just fine via MQTT, though in my rrd file i see only 0’s and the graph shows no data 
Item:
Number isaacs_temp "Isaacs Room Temperature [%.1f °C]" <temperature>
{ mqtt="<[openhab:tele/sonoffsingle1/SENSOR:state:JSONPATH($.DHT22-14.Temperature)]" }
rrd.persist:
Strategies {
//rrd chart stuff
everyMinute:"0 * * * * ?"
Default = everyChange
}
Items { isaacs_temp : strategy = everyUpdate, everyMinute, restoreOnStartup }