Google Analytics Measurement protocol event tracking : events not logging
The problem was that I wasn't setting the el and ev parameters.
The correct call is :
https://www.google-analytics.com/collect?v=1&tid=UA-5520857-25&cid=1260961011.1389432370&t=event&ec=Test-event-cat&ea=Test-event-action&el=test-label&ev=1