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Verify SpeedIndex relative last week/month values
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Description

I got some feedback from Jeroen Van Den Berghe that when he tried out our dashboard (he also use WebPageTest) that the numbers when we compare todays SpeedIndex to one week/month back seemed to be wrong (by looking at the actual values instead of just compare) in https://grafana.wikimedia.org/dashboard/db/webpagetest

Screen Shot 2017-02-20 at 6.30.50 AM.png (908×2 px, 290 KB)

Lets verify and test that they are ok + also check at the same for our Navigation Timing metrics.

Event Timeline

Peter claimed this task.

The problem Jeroen seen was that going back in time, and diffing the current value with the old one gave crazy numbers like: 4062 - 3552 = 844 :)

On our instance the values match, so it's probably a Graphite thing on his side (I verified both nav timings and WPT data):

Screen Shot 2017-02-20 at 10.14.54 AM.png (434×2 px, 76 KB)