test: e2e JSONL log verification for request tracing (#7817)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/llm/src/http/service/metrics.rs

@@ -294,6 +294,7 @@ pub struct InflightGuard {
     error_type: ErrorType,
     timer: Instant,
     request_id: String,
+    span: tracing::Span,
 }
 
 /// Requests will be logged by the type of endpoint hit
@@ -1031,6 +1032,7 @@ impl InflightGuard {
             error_type: ErrorType::Internal,
             timer,
             request_id,
+            span: tracing::Span::current(),
         }
     }
 
@@ -1066,6 +1068,7 @@ impl InflightGuard {
 
 impl Drop for InflightGuard {
     fn drop(&mut self) {
+        let _enter = self.span.enter();
         let duration = self.timer.elapsed().as_secs_f64();
         self.metrics.dec_inflight_gauge(&self.model);
         self.metrics.inc_request_counter(

lib/runtime/src/logging.rs

@@ -804,6 +804,12 @@ where
                     trace_id = Some(parent_tracing_context.trace_id.clone());
                     parent_id = Some(parent_tracing_context.span_id.clone());
                     tracestate = parent_tracing_context.tracestate.clone();
+                    if x_request_id.is_none() {
+                        x_request_id = parent_tracing_context.x_request_id.clone();
+                    }
+                    if request_id.is_none() {
+                        request_id = parent_tracing_context.request_id.clone();
+                    }
                 }
             }
 

tests/frontend/conftest.py

@@ -226,6 +226,8 @@ class MockerWorkerProcess(ManagedProcess):
         system_port: int,
         speedup_ratio: int = 100,
         worker_id: str = "mocker-worker",
+        extra_args: list = None,
+        extra_env: dict = None,
     ):
         self.worker_id = worker_id
         self.frontend_port = frontend_port
@@ -245,6 +247,10 @@ class MockerWorkerProcess(ManagedProcess):
         env["DYN_LOG"] = "debug"
         env["DYN_SYSTEM_USE_ENDPOINT_HEALTH_STATUS"] = '["generate"]'
         env["DYN_SYSTEM_PORT"] = str(system_port)
+        if extra_env:
+            env.update(extra_env)
+        if extra_args:
+            command.extend(extra_args)
 
         log_dir = f"{request.node.name}_{worker_id}"