[BEAM-8932][Cleanup] Fix metric reader to use an actually accessible Nonnull annotation.#10807

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dpcollins-google wants to merge 4 commits intoapache:masterfrom

dpcollins-google:fix_metric_reader

Commits on Dec 28, 2019

Commits on Feb 9, 2020

Make MetricsReader use javax.annotation.Nonnull instead of com.sun.istack.internal.NotNull
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