[Monitor] The metricnamespace for the new metrics API is incorrectly specified as a client level parameter

[gucalder]

The metricnamespace for the new metrics API is incorrectly specified as a client level parameter. It is only used in the multi-dimensional Metrics API.

The argument must be specified as method level argument.

[dsgouda]

@gucalder please close this issue if it has been fixed.

[dsgouda]

@gucalder please reopen if necessary