Looks like I messed up the upstream changed and had "timestamp" for the pagerendered event instead of "time".
Bug 1565680 Comment 10 Edit History
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Looks like I messed up the upstream changed and had "timestamp" for the pagerendered event instead of "time". Looks good now: https://treeherder.mozilla.org/#/jobs?repo=try&revision=ec2f9564fc9ca0d428d114a866a60c69b0febb61