align with main branch

ipykernel/kernelbase.py

@@ -988,11 +988,12 @@ async def usage_request(self, stream, ident, parent):
                 for process in self.processes.values()
             ]
         )
-        host_cpu_percent = psutil.cpu_percent()
+        cpu_percent = psutil.cpu_percent()
         # https://psutil.readthedocs.io/en/latest/index.html?highlight=cpu#psutil.cpu_percent
         # The first time cpu_percent is called it will return a meaningless 0.0 value which you are supposed to ignore.
-        if host_cpu_percent is not None and host_cpu_percent != 0.0:
-            reply_content["host_cpu_percent"] = host_cpu_percent
+        if cpu_percent is not None and cpu_percent != 0.0:
+            reply_content["host_cpu_percent"] = cpu_percent
+        reply_content["cpu_count"] = psutil.cpu_count(logical=True)
         reply_content["host_virtual_memory"] = dict(psutil.virtual_memory()._asdict())
         reply_msg = self.session.send(stream, "usage_reply", reply_content, parent, ident)
         self.log.debug("%s", reply_msg)