All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=922484

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=3a861eb208d928b7cd65decf78d6a88145a2405305c5e8ff5a84de5d9405ea02


Bot(s) for this bug's original alert(s):

Win 7 Nvidia GPU Perf
linux-perf
mac-10_12_laptop_low_end-perf
mac-10_13_laptop_high_end-perf

system_health.common_desktop - Benchmark documentation link:
  https://bit.ly/system-health-benchmarks

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/141371e0540000

😿 Pinpoint job stopped with an error.
https://pinpoint-dot-chromeperf.appspot.com/job/141371e0540000

All of the runs failed. The most common error (20/20 runs) was:
ReadValueError: Could not find values matching: {'story': u'load:tools:drive', 'tir_label': u'load_tools', 'histogram': u'cpu_time_percentage'}

This looks like a recovery to normal levels after some kind of fluke.