The implementation has to sanitize Metadata passed to registration methods if the application does not supply the
metric type explicitly, but the type is implied by the used method.
To test the 'min' and 'max' values we have to do this: - run invocation1 and keep it running - wait until the
next minute starts - run invocation2 and stop it right away - wait until the next minute starts - stop
invocation1 - after this, 'min' should be 1 and 'max' should be 2