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NonNegativeBuckets were used for our generated metrics. However, it is in the public metrics package, and users can rely on it to define their histograms.
However, NonNegativeBuckets has a huge number of buckets which lead to large data for the metrics. The users have complained that our buckets are too fine-grained and the cost to export the metrics is quite high.
This PR removes the NonNegativeBuckets and forces the user to define their own buckets for their histograms.