Obtaining only specific metric data

This is a performance issue.

We want to:

• reduce the server load on the API
• reduce network traffic
• reduce the client deserialization CPU load

Until we can specify which datapoints are returned, we have no way of doing this.

We have the same problem getting graph data using the graphId of -1.  We have to retrieve ALL data (sometimes dozens of time series graph lines with ~900 datapoints each), whereas what we really need is ONE line.