isherman: I'm not familiar with the triage-process for Internals>Metrics>UMA.
Could you unassign / triage / put in triage queue / do whatever's typical for that component?

These patches show before-and-after states for applying 'git cl format' to suffixed user-actions:
Before: https://chromium-review.googlesource.com/c/chromium/src/+/554890/1
After: https://chromium-review.googlesource.com/c/chromium/src/+/554890/1..2

After talking to asvitkine@ I believe we would want 'git cl format' to leave the user actions alone on the client side, and instead do this expansion on the server-side.

As you probably could assume, this would be incredibly helpful regarding In-Product Help. Our guide for setting up IPH now is here: https://chromium.googlesource.com/chromium/src/+/master/components/feature_engagement/README.md#Configuring-UMA
I would love to be able to just tell our users to add themselves to an enum.

Wrote a CL for this on my flight in. Will likely polish up and land this or next week.

This is excellent! Then we can clean up the in-product help metrics!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d27270ac2cc6883f4460d74ac687b93badb107d5

commit d27270ac2cc6883f4460d74ac687b93badb107d5
Author: Alexei Svitkine <asvitkine@chromium.org>
Date: Mon Apr 23 15:39:55 2018

Fix support for action suffixes in actions.xml.

There was some previously incomplete support, but
that support didn't really work because pretty_print.py
would just expand all the suffixes and the processed
file would not have the suffix entries, but just the
expanded list. This CL properly preserves the suffixes
in the actions.xml file.

Also, adopt suffixes for some IPH actions to clean them
up and test this functionality.

It also cleans up some redundancy and edge cases in
existing Python code (for example, actions were returned
both in a dict and a set of names, with the latter being
redundant and now simplified.)

Bug:  726400 
Change-Id: I4c73811b9d13ff4e997f1d18a9d3ef0ab9277b06
Reviewed-on: https://chromium-review.googlesource.com/1015293
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552706}
[modify] https://crrev.com/d27270ac2cc6883f4460d74ac687b93badb107d5/tools/metrics/actions/action_utils.py
[modify] https://crrev.com/d27270ac2cc6883f4460d74ac687b93badb107d5/tools/metrics/actions/actions.xml
[modify] https://crrev.com/d27270ac2cc6883f4460d74ac687b93badb107d5/tools/metrics/actions/extract_actions.py
[modify] https://crrev.com/d27270ac2cc6883f4460d74ac687b93badb107d5/tools/metrics/actions/extract_actions_test.py
[modify] https://crrev.com/d27270ac2cc6883f4460d74ac687b93badb107d5/tools/metrics/actions/print_style.py
[modify] https://crrev.com/d27270ac2cc6883f4460d74ac687b93badb107d5/tools/metrics/common/models.py
[modify] https://crrev.com/d27270ac2cc6883f4460d74ac687b93badb107d5/tools/metrics/common/pretty_print_xml.py
[modify] https://crrev.com/d27270ac2cc6883f4460d74ac687b93badb107d5/tools/metrics/histograms/print_style.py
[modify] https://crrev.com/d27270ac2cc6883f4460d74ac687b93badb107d5/tools/metrics/ukm/model.py