That’s how you tell a n00b from a l33t. 
(joking)
curl -H "X-ApiKey: CAVH3JQXE5RbTsjEfGIobZp1huamUYlgwHAbIskQkTZyY9Nw" "https://api.xively.com/v2/feeds/1386935385/datastreams/event_latency?duration=2hours&interval=0"
The use of Firefox with the Modify Headers Plug-In actually works just fine now that you’ve given me a great example URI. Thanks! – Somehow I misunderstood the Xively documentation.
Are you planning on sharing the SmartApp itself, by any chance?
I’d rather not. I don’t think it would be useful for an average user. As for few developers here, it’s not that difficult to write.
Prowling through the charts provides some interesting info.
You can see platform updates being pushed out, also from a pattern perspective, most of the latency delays occur between the top of the hour and 5-6 minutes after.
If folks having delayed scheduling issues would change their schedules to run on the half hour, that alone would help the top of the hour log jamb.
Sick. Can you make this a tile on Action graph or SmartApps