Revisit the metrics query path and add more unit tests

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The metrics query path has very complicated logic and the code is very hard to read. It is better we can revisit them and do some refactoring to improve the readability of the code. The unit tests also need to have more coverage.

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Created March 29, 2019 at 10:53 PM
Updated June 24, 2020 at 10:29 PM