buffer: add some debug logging for number of objects sent
helpful to understand if the thresholds we've set have been hit
Test Plan
ran a few git loads with this debug enabled
Migrated from D6447 (view on Phabricator)
helpful to understand if the thresholds we've set have been hit
ran a few git loads with this debug enabled
Migrated from D6447 (view on Phabricator)