Add FindTailAttr for configurable find_tail behavior #2781
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Add FindTailAttr for configurable find_tail behavior
Summary:
FindTailAttr allows find_tail users to adjust durability and accuracy. Currently, two modes are supported:
Approximate: A fast check that usually returns immediately with the last known tail.
Durable (default): Ensures a reliable tail find.
Loglet implementations can choose to always run Durable find_tail.
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