Can not see past data/Fail to create graph with Raspberry Pi

I installed Caynne to Raspberry pi 3 yesterday.
but I could not see any graph on WEB site.
I think Caynne Cloud site has issue .
Because I confirmed my device update sensor information every 15 sec.
I can see WEB site gauge update at same timing.

Does any one know how can I solve this trouble?

I checked /var/log/caynne.log
I understand like this
Data is sensed every 15 sec.
WEB site information updated by “Send changed data:”
but upload frequency was different by each Units.
This variable fixed “sys:net;speedtest’: 2.3955811110824974”
I want to know how to check how can system get this value form where.

OS
pi@raspberrypi:/var/log/myDevices $ uname -a
Linux raspberrypi 4.14.79-v7+ #1159 SMP Sun Nov 4 17:50:20 GMT 2018 armv7l GNU/Linux

2019-02-10 18:44:07 - myDevices - INFO - Sensors info:
2019-02-10 18:44:08 - myDevices - INFO - Send changed data: [{‘sys:cpu;load’: 23.1}, {‘sys:cpu;temp’: 61.224}, {‘sys:ram;usage’: 563167232}, {‘sys:storage:/;usage’: 5698719744}, {‘sys:net;ip’: ‘192.168.1.100’}, {‘sys:net;speedtest’: 2.3955811110824974}] + sys:gpio
2019-02-10 18:44:22 - myDevices - INFO - Sensors info:
2019-02-10 18:44:23 - myDevices - INFO - Send changed data: [{‘sys:cpu;load’: 22.3}, {‘sys:cpu;temp’: 60.686}, {‘sys:ram;usage’: 567214080}, {‘sys:storage:/;usage’: 5692391424}]
2019-02-10 18:44:37 - myDevices - INFO - Sensors info:
2019-02-10 18:44:38 - myDevices - INFO - Send changed data: [{‘sys:cpu;load’: 23.0}, {‘sys:ram;usage’: 569221120}, {‘sys:storage:/;usage’: 5694808064}]
2019-02-10 18:44:52 - myDevices - INFO - Sensors info:
2019-02-10 18:44:53 - myDevices - INFO - Send changed data: [{‘sys:cpu;load’: 24.5}, {‘sys:ram;usage’: 571322368}, {‘sys:storage:/;usage’: 5696622592}]
2019-02-10 18:45:07 - myDevices - INFO - Sensors info:
2019-02-10 18:45:08 - myDevices - INFO - Send changed data: [{‘sys:cpu;load’: 22.7}, {‘sys:cpu;temp’: 61.224}, {‘sys:ram;usage’: 559230976}, {‘sys:storage:/;usage’: 5699072000}, {‘sys:net;ip’: ‘192.168.1.100’}, {‘sys:net;speedtest’: 2.3955811110824974}] + sys:gpio

For default widgets like cpu, ram etc which are loaded on startup won’t show graph history data. Are you referring to any other sensor widget?

startup won’t show graph history data.
Oh, I hesitated to lean it because I think it’s not working properly.

I will starts to run it.

Thanks!