We already have auto-generated and human comments with the ability to show/hide auto-generated comments. Perhaps we can also add a concept of bot comments and allow to show/hide them. WDYT?

OTH, we may choose to implement this feature in Gerrit instead. Andrii, how long do you think till the time when we can start using Gerrit as an opt-in for Chromium? 

So, the good thing is that people really like to use Dry Runs :) 
The is feature request, and it can be done entirely in Rietveld, if necessary CQ can post extra flag for Dry-run-induced messages.

As for Gerrit, I am certainly sure that review+try/CQ+land for chromium would be possible before end of Q2.

Tags will allow the filtering of these messages in the near future: https://gerrit-review.googlesource.com/75803/

CLs: https://chromereviews.googleplex.com/468597013/ and https://codereview.chromium.org/2131593002

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/infra/infra_internal.git/+/452eb59a3572da8c5fa8656e0efdb4d2e1a5ead4

commit 452eb59a3572da8c5fa8656e0efdb4d2e1a5ead4
Author: tandrii <tandrii@google.com>
Date: Thu Jul 07 16:18:22 2016

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra.git/+/16906cec5dba67d54736c06754052934b4e49598

commit 16906cec5dba67d54736c06754052934b4e49598
Author: tandrii <tandrii@chromium.org>
Date: Thu Jul 07 16:19:23 2016

Rietveld: Mark CQ Dry Run messages as autogenerated.

R=rmistry@chromium.org,andybons@chromium.org
BUG= 596249 

Review-Url: https://codereview.chromium.org/2131593002

[modify] https://crrev.com/16906cec5dba67d54736c06754052934b4e49598/appengine/chromium_rietveld/codereview/views.py

Finally, display CQ status url next to commit box

https://codereview.chromium.org/2123093009

And related issue to stop sending all emails whatsoever on CQ Dry run  http://crbug.com/626427 

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra.git/+/9a9c7be53ad1cc67f4492554feebf256c7972f50

commit 9a9c7be53ad1cc67f4492554feebf256c7972f50
Author: tandrii <tandrii@chromium.org>
Date: Fri Jul 08 10:50:28 2016

Rietveld: add CQ status URL instead of comment.

BUG= 596249 

Review-Url: https://codereview.chromium.org/2123093009

[modify] https://crrev.com/9a9c7be53ad1cc67f4492554feebf256c7972f50/appengine/chromium_rietveld/codereview/models.py
[modify] https://crrev.com/9a9c7be53ad1cc67f4492554feebf256c7972f50/appengine/chromium_rietveld/codereview/utils.py
[modify] https://crrev.com/9a9c7be53ad1cc67f4492554feebf256c7972f50/appengine/chromium_rietveld/codereview/views.py
[modify] https://crrev.com/9a9c7be53ad1cc67f4492554feebf256c7972f50/appengine/chromium_rietveld/templates/patchset.html
[add] https://crrev.com/9a9c7be53ad1cc67f4492554feebf256c7972f50/appengine/chromium_rietveld/tests/test_utils.py

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/infra/infra_internal.git/+/c346a10e53866da6d877268a234475ed603fde63

commit c346a10e53866da6d877268a234475ed603fde63
Author: tandrii <tandrii@google.com>
Date: Fri Jul 08 12:02:14 2016

This has been fixed and deployed. I didn't touch old CQ Dry run messages, as I think it's not worth the effort. However, if there is high demand, I'll fix old messages too.

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/infra/infra_internal.git/+/bedbb409d329ec2ab37573964b725203509db126

commit bedbb409d329ec2ab37573964b725203509db126
Author: tandrii <tandrii@google.com>
Date: Mon Jul 11 13:13:06 2016