Yongjie Zhao 9f66dae328 [bugfix] Fix ZeroDivisionError and get metrics label with percent metrics (#5026) ...

* Fix percent_metrics ZeroDivisionError and can not get metrics with label issue

* convert iterator to list

* get percentage metrics with get_metric_label method

* Adding tests case for expression type metrics

* Simplify expression

2018-05-20 11:10:57 -05:00

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