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`histogram` function is never testing in existing regressions. As the result at least this code being never invoked, need to add a test case to verify histogram feature.
This testcase has been added via following PR,
https://github.com/percona/pg_stat_monitor/pull/172
`histogram` function is never testing in existing regressions. As the result at least this code being never invoked, need to add a test case to verify histogram feature.