Hi. I have a problem with the display of RRD4J charts in the Android client 220.127.116.11. They appear and disappear (refresh with disappear) every 2 seconds. The problem started after upgrading OH from 1.7 to 1.8.3.
In log, then starting:
2016-09-07 20:17:50.333 [INFO ] [.p.rrd4j.internal.RRD4jService] - Removing invalid defintion component = null heartbeat = 0 min/max = 0.0/0.0 step = 0 0 archives(s) =  0 items(s) = 
rrd4j config is:
// persistence strategies have a name and a definition and are referred to in the “Items” section
// for rrd charts, we need a cron strategy
everyMinute : “0 * * * * ?”
//DemoSwitch,NoOfLights,Window_GF_Toilet,Heating* : strategy = everyChange, everyMinute, restoreOnStartup
// let’s only store temperature values in rrd
- : strategy = everyMinute, restoreOnStartup
what to do?