I recently added a case to anonymize UUIDs in  Issue 721115 . So that means the Client IDs format matches that of UUIDs.

https://en.wikipedia.org/wiki/Universally_unique_identifier

We intentionally include client IDs in feedback reports so we'll be able to find corresponding crash reports. Please exclude them from the filtering.

re #3: Also, other UUIDs are probably not PII of any sort. We should not try to annonymize them for no good reason. If they are useless in the report, I would rather exclude them from there.

Can we revert the UUID obfuscation ASAP?

I already had a CL before I went on vacation for whitelisting those values. 
https://codereview.chromium.org/2953353002/ Will land it now.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/164b863497272d4b45dc3ee5e19920f4b870a846

commit 164b863497272d4b45dc3ee5e19920f4b870a846
Author: afakhry <afakhry@chromium.org>
Date: Thu Jun 29 18:15:29 2017

Support anonymizer whitelisted UUIDs

The recent addition to the anonymizer tool to scrub any UUID was meant
to scrub only peripherals IDs. But we have other important entries that
shouldn't be scrubbed.
This CL adds a list of whitelisted IDs that won't be scrubbed.

BUG= 734566 

Review-Url: https://codereview.chromium.org/2953353002
Cr-Commit-Position: refs/heads/master@{#483425}

[modify] https://crrev.com/164b863497272d4b45dc3ee5e19920f4b870a846/chrome/browser/feedback/system_logs/system_logs_fetcher.cc
[modify] https://crrev.com/164b863497272d4b45dc3ee5e19920f4b870a846/chrome/browser/feedback/system_logs/system_logs_fetcher.h

[Auto-generated comment by a script] We noticed that this issue is targeted for M-60; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-60 label, otherwise remove Merge-TBD label. Thanks.

Before merging anything, please make sure that privacy signs this off. I am surprised that no privacy reviewer was on the CL.

Makes sense, but note that this change is restoring the state we were in before https://codereview.chromium.org/2905723002 inadvertently made us drop these IDs.

This bug requires manual review: M60 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

I agree with #11, please update the bug when reviews are completed 

+glevin for privacy. This CL is just restoring the old behavior.

I'm fine with restoring the old behavior for the moment, but I'd still like to continue the ongoing email discussion and clarify my understanding around client_id and feedback reports.

Re#16: Does that mean OK to merge or no merge until further investigation is done? 

I think is ok to merge as per #16

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Re#17: Yes, ok to merge, thanks for checking.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/caa9199455ac156af7104f7cba8ccc8c0c86493a

commit caa9199455ac156af7104f7cba8ccc8c0c86493a
Author: Ahmed Fakhry <afakhry@google.com>
Date: Wed Jul 05 17:14:39 2017

[Merge to M60] Support anonymizer whitelisted UUIDs

The recent addition to the anonymizer tool to scrub any UUID was meant
to scrub only peripherals IDs. But we have other important entries that
shouldn't be scrubbed.
This CL adds a list of whitelisted IDs that won't be scrubbed.

TBR=xiyuan@chromium.org
BUG= 734566 

Review-Url: https://codereview.chromium.org/2953353002
Cr-Original-Commit-Position: refs/heads/master@{#483425}
Review-Url: https://codereview.chromium.org/2971763003 .
Cr-Commit-Position: refs/branch-heads/3112@{#515}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}

[modify] https://crrev.com/caa9199455ac156af7104f7cba8ccc8c0c86493a/chrome/browser/feedback/system_logs/scrubbed_system_logs_fetcher.cc

Verified on M60 build 9592.71.0
http://feedback/#/Report/69610348075

Verified the fix in Chrome OS 9592.71.0, 60.0.3112.80. 
http://feedback/#/Report/69610939746