[NIXL] Improve request_finished() debug logs (#25665)

Signed-off-by: Mark McLoughlin <markmc@redhat.com>

vllm/distributed/kv_transfer/kv_connector/v1/nixl_connector.py

@@ -463,7 +463,9 @@ class NixlConnectorScheduler:
 
         params = request.kv_transfer_params
         logger.debug(
-            "NIXLConnector request_finished, request_status=%s, kv_transfer_params=%s",
+            "NIXLConnector request_finished(%s), request_status=%s, "
+            "kv_transfer_params=%s",
+            request.request_id,
             request.status,
             params,
         )
@@ -495,6 +497,12 @@ class NixlConnectorScheduler:
 
         if delay_free_blocks:
             # Prefill request on remote. It will be read from D upon completion
+            logger.debug(
+                "NIXLConnector request_finished(%s) waiting for %d seconds "
+                "for remote decode to fetch blocks",
+                request.request_id,
+                envs.VLLM_NIXL_ABORT_REQUEST_TIMEOUT,
+            )
             self._reqs_need_send[request.request_id] = (
                 time.perf_counter() + envs.VLLM_NIXL_ABORT_REQUEST_TIMEOUT
             )