We never got it to work at all, we gave up. We have CloudFlare in front of us and get data from there. Not as detailed as Google, but WAY more accurate.
config.json's url ignored on Google Cloud Platform
No mater what i put to my url property - server is always listening on port 80 at ip 0.0.0.0. Here is my ./nodebb log
31/8 20:16  - info: Time: Mon Aug 31 2015 20:16:13 GMT+0000 (UTC) 31/8 20:16  - info: Initializing NodeBB v0.8.0 31/8 20:16  - info: NodeBB Ready 31/8 20:16  - info: NodeBB is now listening on: 0.0.0.0:80
How to correct that?
0.0.0.0 is normal.
Aargh - i just forgot to mark " Allow HTTP traffic " at console. Works just fine