After selecting your metrics in the "Browse" section from the CW Dashboard or CW Metrics, you can go to the "Graphed metrics" tab and set the following 2 options:

• Statistic: Sum
• Period: 1 minute

Also, for the line chart display, I'm not a big fan of the default one as there is no line when there is no data... But you could fix that with following:

1. Add math > Common > Fill
2. If you have multiple metrics, replace METRICS() with the ID of your expression (the ID column will appear only once you will add a custom expression)