Implementation of a metric for each workflow run that provides payload size. Nintex currently has 500mb limitation on payload size and there is no way to know whether that limit has been hit, until it is hit, which terminates the workflow. This is especially problematic when using repeating sections.
If we have an idea on the baseline for workflow payload size, or even what the payload size is after making a change, it would help quantify whether that change was effective, and if we are close to reaching that threshold. Also, with a repeating section, we would know at what number of repeats we might encounter the issue, so we can make changes based on that information.