Report the number of Phabricator diffs posted
Report the number of Phabricator diffs posted

Summary: Knowing how many actionable diffs were posted is useful for monitoring purposes.

Test Plan: Existing unit.

Reviewers: josiah

Reviewed By: josiah

Subscribers: changesbot, wwu

Differential Revision: https://tails.corp.dropbox.com/D103759

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