All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=624823

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgkv6crQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg4sHPsQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg4r3FtgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg4s_0uwsM


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

chromium-webrtc-trunk-tot-rel-mac

Moving this nonessential bug to the next milestone.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Metrics are back down again, as of r404143. I have added the new alerts to this bug; see the existing plots. (The timeline may have to be expanded a bit, to see both when the metrics go up, and when they go back down again.)

I cannot directly find any culprit, neither in Chromium nor in WebRTC.