feat(usage): enrich audit metadata and detail views

apps/aether-gateway/src/handlers/admin/observability/monitoring/trace.rs

@@ -30,6 +30,25 @@ struct ResolvedAdminMonitoringTrace {
     usage: Option<StoredRequestUsageAudit>,
 }
 
+async fn hydrate_admin_monitoring_trace_response_body(
+    state: &AdminAppState<'_>,
+    mut usage: StoredRequestUsageAudit,
+) -> Result<StoredRequestUsageAudit, GatewayError> {
+    let is_error_node = !usage.status.eq_ignore_ascii_case("completed")
+        || usage
+            .status_code
+            .is_some_and(|status| !(200..300).contains(&status));
+    let response_body_ref = if is_error_node && usage.response_body.is_none() {
+        usage.response_body_ref.clone()
+    } else {
+        None
+    };
+    if let Some(body_ref) = response_body_ref.as_deref() {
+        usage.response_body = state.resolve_request_usage_body_ref(body_ref).await?;
+    }
+    Ok(usage)
+}
+
 pub(super) async fn build_admin_monitoring_trace_request_response(
     state: &AdminAppState<'_>,
     request_context: &AdminRequestContext<'_>,
@@ -92,6 +111,10 @@ async fn resolve_admin_monitoring_trace(
             .read_request_usage_audit_shallow(request_id)
             .await
             .map_err(|err| GatewayError::Internal(err.to_string()))?;
+        let usage = match usage {
+            Some(usage) => Some(hydrate_admin_monitoring_trace_response_body(state, usage).await?),
+            None => None,
+        };
         return Ok(Some(ResolvedAdminMonitoringTrace { trace, usage }));
     }
 
@@ -102,9 +125,10 @@ async fn resolve_admin_monitoring_trace(
         .await
         .map_err(|err| GatewayError::Internal(err.to_string()))?
     {
-        usage_candidates.push(usage);
+        usage_candidates.push(hydrate_admin_monitoring_trace_response_body(state, usage).await?);
     }
     if let Some(usage) = state.find_request_usage_by_id(request_id).await? {
+        let usage = hydrate_admin_monitoring_trace_response_body(state, usage).await?;
         if !usage_candidates.iter().any(|item| item.id == usage.id) {
             usage_candidates.push(usage);
         }