The build_metrics Perfherder data on the "add test data" dialog is missing "extraOptions" from the "tests" selection box. As a result, you see a bunch of duplicate strings e.g. "build times summary opt." These strings used to contain the "extraOptions" values. e.g. "build times summary opt taskcluster-m4.4xlarge." The build peers think this is a regression in the past few days. The raw data the build_metrics are submitting looks like: PERFHERDER_DATA: {"framework": {"name": "build_metrics"}, "suites": [{"subtests": [{"name": "libxul.so", "value": 90238204}], "name": "installer size", "value": 56908678, "alertThreshold": 0.25}, {"subtests": [{"name": "configure", "value": 31.61002802848816}, {"name": "pre-export", "value": 0.6211860179901123}, {"name": "export", "value": 29.17535400390625}, {"name": "compile", "value": 358.29607796669006}, {"name": "misc", "value": 4.636362075805664}, {"name": "libs", "value": 14.903687000274658}, {"name": "tools", "value": 0.4137139320373535}, {"name": "buildsymbols", "value": 100.30911898612976}, {"name": "package", "value": 140.54600191116333}, {"name": "l10n-check", "value": 184.47081184387207}, {"name": "package-tests", "value": 205.67192316055298}, {"name": "upload", "value": 217.7267951965332}], "extraOptions": ["taskcluster-m4.4xlarge"], "name": "build times", "value": 661.4050681591034}]}

Sorry about this, this was related to some important work :rwood was doing. It should be fixed in bug 1331745, which should be landing to production shortly.