refactor (sdk:web): compute latency/duration in sdk properly and upda…

…te use of it in the playground

agenta-cli/agenta/sdk/tracing/inline.py

@@ -41,7 +41,6 @@ class LifecycleDTO(BaseModel):
 class TimeDTO(BaseModel):
     start: datetime
     end: datetime
-    span: int
 
 
 class StatusCode(Enum):
@@ -846,12 +845,9 @@ def parse_from_otel_span_dto(
         else None
     )
 
-    duration = (otel_span_dto.end_time - otel_span_dto.start_time).total_seconds()
-
     time = TimeDTO(
         start=otel_span_dto.start_time,
         end=otel_span_dto.end_time,
-        span=round(duration * 1_000_000),  # microseconds
     )
 
     status = StatusDTO(
@@ -863,6 +859,13 @@ def parse_from_otel_span_dto(
 
     data, metrics, meta, tags, refs = _parse_from_attributes(otel_span_dto)
 
+    duration = (otel_span_dto.end_time - otel_span_dto.start_time).total_seconds()
+
+    if metrics is None:
+        metrics = dict()
+
+    metrics["acc.duration.total"] = round(duration * 1_000, 3)  # milliseconds
+
     root_id = str(tree_id)
     if refs is not None:
         root_id = refs.get("scenario.id", root_id)

agenta-web/src/components/Playground/Views/TestView.tsx

@@ -623,9 +623,7 @@ const App: React.FC<TestViewProps> = ({
                         const firstTraceNode = tree.nodes[0]
                         newDataList[index] = {
                             cost: firstTraceNode?.metrics?.acc?.costs?.total ?? null,
-                            latency: firstTraceNode?.time?.span
-                                ? firstTraceNode.time.span / 1_000_000
-                                : null,
+                            latency: firstTraceNode?.metrics?.acc?.duration?.total / 1000 ?? null,
                             usage: firstTraceNode?.metrics?.acc?.tokens?.total ?? null,
                         }
                     }