Include a zero bucket, zeros are being reported as 1

[Groxx]

With a min bucket of 1, a 0 is reported as a 1, which is quite misleading for this kind of use.

Sorta obvious in retrospect, but we have so few histograms anywhere that I apparently don't have any safe habits built up.

[coveralls]

Pull Request Test Coverage Report for Build 019074a7-be79-43e7-b97d-7674d472b3a6

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 48 unchanged lines in 10 files lost coverage.
• Overall coverage decreased (-0.02%) to 71.505%

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Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
service/matching/tasklist/task_list_manager.go	2	77.05%
service/frontend/api/handler.go	2	75.62%
service/history/task/transfer_standby_task_executor.go	3	86.23%
service/history/task/task.go	3	84.81%
common/persistence/nosql/nosql_task_store.go	3	85.52%
common/task/fifo_task_scheduler.go	3	84.54%
common/archiver/filestore/historyArchiver.go	4	80.95%
service/history/execution/cache.go	6	74.61%
service/history/task/task_util.go	20	60.29%

Totals
Change from base Build 01907465-3a13-43f8-89cc-21fc60d6d529:	-0.02%
Covered Lines:	105293
Relevant Lines:	147252

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💛 - Coveralls