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This metric provides insight into the ways that Nearby Connections
disconnect, including failures reasons. This will help us dig into
potential failure reasons for connection stability.

Bug: 1163979
Change-Id: I1e685ea6863cfe2bb12a7bbdd20decd9887337ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616478
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841643}