Description

We don't pass the logger into these functions/classes, but we should. This would help us surface warnings and other useful information.

Desired behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)

• add logger to memcached/batching stuff
• log in places marked with this task's ID

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Completion checklist

• Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Back-end_Task/Bug_completion_checklist