Cannot see success metrics

Hi there, I can see the duration of scripts when I curl metrics;

curl localhost:9469/metrics

And I see results like this:

scripts_duration_seconds{script="scripttest",quantile="0.25"} 0.007867117

This is great, but what I really need is the metric for success or failure. Can you let me know how I can populate that information? I must be missing something. Thanks in advance. Ben