Fix SlidingTimeWindowArraySample to expire metrics correctly #487
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The ChunkedAssociativeArray.Trim method had a bug where it would fail to remove all chunks when every chunk contained only values older than the trim threshold. When indexAfterStartKey returned -1, indicating all chunks should be removed, the removal loop would not execute. This caused SlidingTimeWindowArraySample-based metrics to get stuck at their last value instead of returning to zero after the time window expired. The fix adds explicit handling for the indexAfterStartKey == -1 case to ensure all chunks are properly removed when needed.
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The ChunkedAssociativeArray.Trim method had a bug where it would fail to remove all chunks when every chunk contained only values older than the trim threshold. When indexAfterStartKey returned -1, indicating all chunks should be removed, the removal loop would not execute. This caused SlidingTimeWindowArraySample-based metrics to get stuck at their last value instead of returning to zero after the time window expired. The fix adds explicit handling for the indexAfterStartKey == -1 case to ensure all chunks are properly removed when needed.