That is correct - the more builds you run this on, the more dense the data is and longer the trend lines will get.
One thing that you could do, is attach the HTML Summary report as an artefact to the Horde step this executed from. That way, when you click on the dot it shows you all the horde runs associated with the data set. This only works if this APT run was sourced from Horde, otherwise it can’t link back to the steps.
I am exploring more support for non horde sourced builds, which really speaks to a lot of the challenges via the direct PRT emission that you may be facing - all the Horde Template-Job-Step-Stream context is missing. I’ll provide some more updates on that in the future, but this will require out of band patching of PerfReportTool and Horde Server/Dashboard (until I can get it into the official 5.8.X patching stream).
The whole Horde Perf Trend feature stems from the fact that reasoning about granular perf data (aka intra build) makes it difficult to introspect; you don’t know if it’s a build worth looking at. If, however, you have the “top of funnel” trendline, you can see that there’s a build worth diving into (and reviewing the detailed CSV data - not the summary table). Fundamentally, it’s about the information & diagnostic hierarchy.
Kind regards,
Julian