I like the idea of having some quick group filters of some sort. What does classification mean in this case? 

Also, we do already have plans to add bulk alert actions ( https://bugs.chromium.org/p/chromium/issues/detail?id=717713 )  to grouping, which I think will help with making grouping easier. 

It's a field within the stages: not sure where it comes from. See http://screen/apCa46wTQgo.png for an example.

CCing davidriley since I think this is CrOS-related 

This is CrOS related.

What I'd really love is a regex that can be applied to the alert.  I think that would make sense for SoM in general.  I'm not sure of how we could implement that though.

In this particular case the classification is part of the Notes/Links section that CrOS  dispatcher generates as useful information about the build failure.  We could probably search those easier, but I think that there's a lot of other alert text (like the name of the build) that isn't directly included there which would be useful to filter upon.

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/62f0fe28e497f16ac859ad7159d07fd4a6aa03d8

commit 62f0fe28e497f16ac859ad7159d07fd4a6aa03d8
Author: David Riley <davidriley@chromium.org>
Date: Thu Jul 20 00:33:28 2017

SoM: Add filtering of shown alerts via regexp.

Bug:  725591 
Change-Id: I58d978a36a8c3bbaf1f0cb9debab2f45d10d39f9
Reviewed-on: https://chromium-review.googlesource.com/578480
Reviewed-by: Tiffany Zhang <zhangtiff@chromium.org>
Commit-Queue: David Riley <davidriley@chromium.org>

[modify] https://crrev.com/62f0fe28e497f16ac859ad7159d07fd4a6aa03d8/go/src/infra/appengine/sheriff-o-matic/frontend/elements/som-alert-view/som-alert-view.js
[add] https://crrev.com/62f0fe28e497f16ac859ad7159d07fd4a6aa03d8/go/src/infra/appengine/sheriff-o-matic/frontend/elements/som-time-behavior.html
[modify] https://crrev.com/62f0fe28e497f16ac859ad7159d07fd4a6aa03d8/go/src/infra/appengine/sheriff-o-matic/frontend/elements/som-alert-view/som-alert-view.html
[modify] https://crrev.com/62f0fe28e497f16ac859ad7159d07fd4a6aa03d8/go/src/infra/appengine/sheriff-o-matic/frontend/elements/som-alert-item/som-alert-item.js
[modify] https://crrev.com/62f0fe28e497f16ac859ad7159d07fd4a6aa03d8/go/src/infra/appengine/sheriff-o-matic/frontend/elements/som-alert-item/som-alert-item.html
[modify] https://crrev.com/62f0fe28e497f16ac859ad7159d07fd4a6aa03d8/go/src/infra/appengine/sheriff-o-matic/frontend/test/som-alert-view-test.html