Summary:
We're seeing issues where a file show up as "M" while it isn't expected so. When
running "hg status" again, the file disappeared. Existing logs suggest that
watchman does not think anything has changed between the two "status" commands.
Therefore add more logs of the internals to try to get more insights.
Differential Revision: D13954209
fbshipit-source-id: 0b89a6da5e8702e707440ef2e1823eb4968c10be
