Provide APIs to help application developers test their Histogram-using code

I have an application that uses Histogram. I want to write some tests that assert that my application is putting values into the right buckets of that histogram.

To read values out of the Histogram it seems that need to either:

• look at the Histogram's private _buckets attribute, or
• call Histogram.collectand look at the resulting Metric objects which are documented as "intended only for internal use" and then look at its Samples which aren't documented at all.

Neither of these seems particularly satisfactory. It would be very helpful if client_python provided some way to read bucket counts and the total sum from a Histogram, using documented APIs clearly marked as intended for external use (perhaps only in test suites).

Comienza inspeccionando la implementación de Histogram del cliente de Python, especialmente su atributo _buckets y su método collect, junto con los objetos Metric y Samples que devuelve. Define y prueba una API externa documentada para leer los recuentos de los buckets y la suma total, con cobertura que demuestre que las pruebas de la aplicación pueden comprobar valores sin usar objetos privados o destinados únicamente al uso interno.