The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/cda7ca909d4178c2a350ff674f10212f84f7b430

commit cda7ca909d4178c2a350ff674f10212f84f7b430
Author: Paul Hobbs <phobbs@google.com>
Date: Wed May 24 06:59:07 2017

[autotest] Add 500.html

Add a 500.html page. We get a lot of noisey logs from the "TemplateDoesNotExist:
500.html" error which occurs any time we have an exception.

BUG= chromium:725720 
TEST=None

Change-Id: I123c8bb577cd88ed8ae36ca5a3bb10112590cf2a
Reviewed-on: https://chromium-review.googlesource.com/513608
Commit-Ready: Paul Hobbs <phobbs@google.com>
Tested-by: Paul Hobbs <phobbs@google.com>
Reviewed-by: Dan Shi <dshi@google.com>

[add] https://crrev.com/cda7ca909d4178c2a350ff674f10212f84f7b430/frontend/afe/500.html

 Issue 730113  has been merged into this issue.

This is still relevant; apache error log metrics aren't too useful at the moment.