Link to most recent failing build: https://chrome-swarming.appspot.com/task?id=3e193812b7925310&refresh=10&show_raw=1

Traceback (most recent call last):
  RunBenchmark at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:368
    expectations=expectations, max_num_values=benchmark.MAX_NUM_VALUES)
  Run at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:271
    results.PopulateHistogramSet()
  PopulateHistogramSet at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/results/page_test_results.py:282
    vinn_result = convert_chart_json.ConvertChartJson(chart_json_path)
  ConvertChartJson at /b/swarming/w/ir/third_party/catapult/tracing/tracing/value/convert_chart_json.py:24
    js_args=[os.path.abspath(chart_json)])
  RunFile at /b/swarming/w/ir/third_party/catapult/third_party/vinn/vinn/_vinn.py:190
    return _RunFileWithD8(temp_boostrap_file, js_args, v8_args, stdout, stdin)
  _RunFileWithD8 at /b/swarming/w/ir/third_party/catapult/third_party/vinn/vinn/_vinn.py:269
    'Exception raised when executing %s:\n%s' % (js_file_path, out))
RuntimeError: Exception raised when executing /b/swarming/w/ityvgy5u/tmpGN41A1/_tmp_boostrap.js:
/tracing/base/utils.html:193: Error: getOnlyElement was passed an iterable with multiple elements.
      throw new Error(
      ^
Error: getOnlyElement was passed an iterable with multiple elements.
    at Object.getOnlyElement (/tracing/base/utils.html:193:13)
    at addSharedDiagnostic (/tracing/value/chart_json_converter.html:34:16)
    at Function.convertChartJson (/tracing/value/chart_json_converter.html:97:13)
    at eval (/b/swarming/w/ir/third_party/catapult/tracing/tracing/value/convert_chart_json_cmdline.html:19:27)
    at Object.loadHTMLFile (/b/swarming/w/ir/third_party/catapult/third_party/vinn/vinn/html_imports_loader.js:140:5)
    at /b/swarming/w/ir/third_party/catapult/third_party/vinn/vinn/d8_bootstrap.js:151:19

So it doesn't look like it is a particular story that is failing but telemetry is just crashing.  Adding Ethan in case he has any insight given it is during the call to PopulateHistogramSet()