Please build an EB widget that allows for tracing of Trace Networks (distinct from the concept of tracing Utility Networks). Please work with JS SDK team with the enablement of the JS SDK to "understand" network topology which is a prerequisite item for any kind of widget to be be built.
I know ESRI has made the past decision to not support Trace Networks on the web. I want to encourage ESRI to rethink this position for several reasons. First, utility networks make zero sense for simple topologically defined hydro networks that still need tracing functionality. A UN is a lot of bloat for these. Second, you already have the Trace Network capability exposed at the server level. It seems odd to leave the job "half finished" and not offer any ESRI tools utilizing it. Third, ESRI needs to have some kind of "plan B" insurance to offer customers with the coming of NSRS 2022 which has significant impacts to future and current utility networks in the USA as there is no way to reproject a currently built UN.
