All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=665923

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgi92VoQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgi_nUsAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgi9nFvQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgi7mxtwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgi8rjpwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs6uE5QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg09fb6woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg85uSswoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg89aLpAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg84TirgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg85HyuQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs8L-4woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0-Hv-AsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs92A7wkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs7-iowoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs8O9tgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8_jVqgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs6X3pwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg85GAsQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg87LxoAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs-XotgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs9uPtwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs8X79AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg893gtQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg84rrvwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg85GUqAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs7-2sgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8_6ppAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs5SG6AsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg84rrvwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg85vEogoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg88aN8woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8_LAuQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8-z7qwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg89aVuQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg88Dj_wkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg84T4twoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs6uEpQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8930rAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8_7H7AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg85uOqgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8_KKtQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg86aytwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgs_ni5AoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg86zlqQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg85ijvAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8_7dtQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8-HougkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgi9C5vwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg85f1oAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8_ifpgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg8-vfvQoM


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

webrtc-linux-large-tests
webrtc-mac-large-tests
webrtc-win-large-tests

Yes, that seems very plausible.

My first guess is that these tests rely on undocumented behaviour: previously RED over RTX was implicitly enabled whenever RED was enabled. After the suspected CL, this is no longer the case. I'll look into it in detail.

The following revision refers to this bug:
  https://chromium.googlesource.com/external/webrtc.git/+/fbfb536ee94dcebfc2f80ccfea1bbab2b1a4cd69

commit fbfb536ee94dcebfc2f80ccfea1bbab2b1a4cd69
Author: brandtr <brandtr@webrtc.org>
Date: Thu Nov 17 12:18:37 2016

Explicitly enable RED over RTX in rampup tests.

Also remove unused |rtx_ssrc_map_| member.

BUG= chromium:665923 

Review-Url: https://codereview.webrtc.org/2508973002
Cr-Commit-Position: refs/heads/master@{#15127}

[modify] https://crrev.com/fbfb536ee94dcebfc2f80ccfea1bbab2b1a4cd69/webrtc/call/rampup_tests.cc
[modify] https://crrev.com/fbfb536ee94dcebfc2f80ccfea1bbab2b1a4cd69/webrtc/call/rampup_tests.h

The metrics are back up in WebRTC revision #15127.

There will be a bunch of alerts in a day or two :)

Added some of the expected alerts to this bug.