diff --git a/ipykernel/kernelbase.py b/ipykernel/kernelbase.py
index 5ef16fb37..050aeffba 100644
--- a/ipykernel/kernelbase.py
+++ b/ipykernel/kernelbase.py
@@ -929,7 +929,7 @@ def get_process_metric_value(self, process, name, attribute=None):
             return None
 
     async def usage_request(self, stream, ident, parent):
-        reply_content = {"hostname": socket.gethostname()}
+        reply_content = {"hostname": socket.gethostname(), "pid": os.getpid()}
         current_process = psutil.Process()
         all_processes = [current_process] + current_process.children(recursive=True)
         process_metric_value = self.get_process_metric_value