add hostname to the usage reply

Author: echarles

ipykernel/kernelbase.py

@@ -13,6 +13,7 @@
 import os
 from signal import signal, default_int_handler, SIGINT
 import sys
+import socket
 import time
 import uuid
 import warnings
@@ -879,7 +880,9 @@ def get_process_metric_value(self, process, name, attribute=None):
             return None
 
     async def usage_request(self, stream, ident, parent):
-        reply_content = {}
+        reply_content = {
+            'hostname': socket.gethostname()
+        }
         if psutil is None:
             return reply_content
         current_process = psutil.Process()