Fix exemplar list in Histogram and Count aggregations #3364
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Description
ExemplarList generated for Count and Histogram aggregate actions is accumulating the exemplars across different aggregation periods. It should be reset every time new aggregation window starts. This fix resets and includes only new exemplar list whenever a new metric event is generated at the end of aggregation duration.
Issues Resolved
Resolves #[Issue number to be closed when this PR is merged]
Check List
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