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fix(performance): send post to kuma for custom ie-load-event-end metric #1001
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@tkadlec This will post a message to Kuma to set a custom mark at the same time as we send
performance.timing.loadEventEndfor GA beaconing.On the Kuma side I will then also set a new custom mark in the head of the pages similar to https://github.com/mdn/interactive-examples/blob/master/js/editor-libs/perf.js#L18
I will then also set a new measure which will use the mark from the head in Kuma as
startMarkand then the mark we are creating here asendMark. That should then give us the duration equal toie-load-completeLet me know your thoughts. Thanks!