X_BENCH_RUN_FAILED
Means
a bench run produced no publishable figure
Typical cause
http-hello got a non-2xx answer or no answer at all (the server refused or died mid-run), its --start command never answered 2xx, or a first-hour step failed in a clean first run. The run is reported with every count, never as a figure
Fix
curl -si <url> for http-hello; for first-hour, the failed step's command in the work directory the finding names