in geronimo-microprofile-reporter/src/main/java/org/apache/geronimo/microprofile/reporter/storage/front/ReporterEndpoints.java [272:283]
public Html getSpan(@QueryParam("spanId") final String id) {
final SpanEntry value = database.getSpans().snapshot().stream()
.map(InMemoryDatabase.Value::getValue)
.filter(it -> it.getSpanId().equals(id))
.findFirst()
.orElseThrow(() -> new BadRequestException("No matching span"));
return new Html("main.html")
.with("view", "span.html")
.with("colors", COLORS)
.with("title", "Span")
.with("span", value);
}