I'm still seeing this too, bumping priority and adding component since this seems 100% broken.

It fails to load /components/webcomponentsjs/webcomponents.js.
Looks like this is broken since version cb00036. Last working version is e03269c.

And culprit CL is https://codereview.chromium.org/1692743002.

And fix is https://codereview.chromium.org/1975773002.

Note that fix just reintroduces Polymer back. The timeline is still broken.

I've tried bisecting history to find a version that was still working, but seems like timeline was broken since at least August last year. It could also be that it is broken because underlying data model has changed. The error message with my fix restoring Polymer is:

Import error
Error: Unrecognized color cq_build_attempt_running

I guess it has to do with the framework which draws the timeline. I am not familiar with it, but pgervais may be as the timeline was done by his intern. Looks like the color was introduced in https://codereview.chromium.org/1236243002, but I couldn't find any CL that actually defines it.

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra.git/+/05106f0a0414583fccd11050a565a11e8f660384

commit 05106f0a0414583fccd11050a565a11e8f660384
Author: sergiyb <sergiyb@chromium.org>
Date: Thu May 12 17:15:25 2016

Remove rule that removed polymer code

R=phajdan.jr@chromium.org
BUG= 600635 

Review-Url: https://codereview.chromium.org/1975773002

[modify] https://crrev.com/05106f0a0414583fccd11050a565a11e8f660384/appengine/chromium_cq_status/app.yaml

Jochen, Adam -  this feature has been broken for months :(

Is this a feature that you do use/want to use?  If so, we'll look into how we can get an owner for it and proper monitoring so we don't break again.  Otherwise, if it is mostly unused, we'd like to remove it.

I only noticed when a new external contributor clicked on it and found a blank page. From my point of view removing it is fine (and in fact removing the link to it should be done ASAP).

Replacing myself with stip because he hosted the internship, not me.

Jochen, are you also fine with having timeline removed or do you think we should search for an owner for it?

Whatever the long-term decision here is, it seems like removing the link for now is the right next step to avoid further confusion.

I'm fine with having it removed

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra.git/+/a6513553588682af329efd2b1909890776d2176e

commit a6513553588682af329efd2b1909890776d2176e
Author: sergiyb <sergiyb@chromium.org>
Date: Tue May 31 06:58:12 2016

Remove link to timeline view as it's broken and unowned

R=phajdan.jr@chromium.org
BUG= 600635 

Review-Url: https://codereview.chromium.org/2024053002

[modify] https://crrev.com/a6513553588682af329efd2b1909890776d2176e/appengine/chromium_cq_status/templates/patch_status.html

I've removed the linkt. Mike, can you please remove the feature completely?

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/infra/infra_internal.git/+/0085fac87e0b81dc20a23c3726d5b61b95d74d20

commit 0085fac87e0b81dc20a23c3726d5b61b95d74d20
Author: sergiyb <sergiyb@google.com>
Date: Fri Jun 03 16:21:10 2016

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra.git/+/4b2fff9be64093df864b911017d5b362d1794d69

commit 4b2fff9be64093df864b911017d5b362d1794d69
Author: sergiyb <sergiyb@chromium.org>
Date: Tue Jun 07 16:42:20 2016

Remove [timeline] from the list of raw CQ events

R=tandrii@chromium.org
BUG= 600635 

Review-Url: https://codereview.chromium.org/2040253002

[modify] https://crrev.com/4b2fff9be64093df864b911017d5b362d1794d69/appengine/chromium_cq_status/js/recent.js

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra.git/+/4a429a758183ec5e2fff1c0dff48b1eb31c7d211

commit 4a429a758183ec5e2fff1c0dff48b1eb31c7d211
Author: Sergiy Byelozyorov <sergiyb@chromium.org>
Date: Thu Jun 09 09:53:24 2016

Removed timeline code

TBR=phajdan.jr@chromium.org
BUG= 600635 

Review URL: https://codereview.chromium.org/2056663002 .

[modify] https://crrev.com/4a429a758183ec5e2fff1c0dff48b1eb31c7d211/appengine/chromium_cq_status/README
[delete] https://crrev.com/a404cc67fbb82decf0c7b5391cd9924136c5f7f3/appengine/chromium_cq_status/handlers/builder_timeline_data.py
[delete] https://crrev.com/a404cc67fbb82decf0c7b5391cd9924136c5f7f3/appengine/chromium_cq_status/handlers/patch_timeline.py
[delete] https://crrev.com/a404cc67fbb82decf0c7b5391cd9924136c5f7f3/appengine/chromium_cq_status/handlers/patch_timeline_data.py
[delete] https://crrev.com/a404cc67fbb82decf0c7b5391cd9924136c5f7f3/appengine/chromium_cq_status/handlers/test/builder_timeline_data_test.py
[delete] https://crrev.com/a404cc67fbb82decf0c7b5391cd9924136c5f7f3/appengine/chromium_cq_status/handlers/test/patch_timeline_data_test.py
[modify] https://crrev.com/4a429a758183ec5e2fff1c0dff48b1eb31c7d211/appengine/chromium_cq_status/main.py
[modify] https://crrev.com/4a429a758183ec5e2fff1c0dff48b1eb31c7d211/appengine/chromium_cq_status/templates/index.html
[delete] https://crrev.com/a404cc67fbb82decf0c7b5391cd9924136c5f7f3/appengine/chromium_cq_status/templates/trace_viewer.html
[delete] https://crrev.com/a404cc67fbb82decf0c7b5391cd9924136c5f7f3/appengine/chromium_cq_status/third_party/catapult

P.S. Deployed new version of chromium-cq-status: 4a429a7.

 Issue 580605  has been merged into this issue.

 Issue 589478  has been merged into this issue.