My iOS app is creating events with a performance based metric. I see this added to the eventsFile and it also appears in the "Custom Events" tab.
However, I cannot create a custom chart that lets me track these metrics. Is this possible, and if so, how?
Unfortunately this functionality is not available out of the box within the Amazon Mobile Analytics console.
As a work-around you could enable auto-export to S3/RedShift and generate the visualizations you're interested in externally.
I suggest having the S3 export enabled at all times, and enabling the RedShift export when needed.