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Log observer that maintains a buffer.
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�LimitedHistoryLogObservera�
L{ILogObserver} that stores events in a buffer of a fixed size::
>>> from twisted.logger import LimitedHistoryLogObserver
>>> history = LimitedHistoryLogObserver(5)
>>> for n in range(10): history({'n': n})
...
>>> repeats = []
>>> history.replayTo(repeats.append)
>>> len(repeats)
5
>>> repeats
[{'n': 5}, {'n': 6}, {'n': 7}, {'n': 8}, {'n': 9}]
>>>
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@param size: The maximum number of events to buffer. If L{None}, the
buffer is unbounded.
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Re-play the buffered events to another log observer.
@param otherObserver: An observer to replay events to.
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