message: Fix bugs in `mem_export.py`
diff: # Requirements: `prometheus_client`, `psutil`
  from http.client import HTTPConnection
  +import os
  from pprint import pprint
  import socket
  +import sys
  import time
  from xmlrpc import client
  from prometheus_client import start_http_server, Summary, Gauge
  import psutil
  -import sys
  class UnixStreamHTTPConnection(HTTPConnection):
  @@ -54,7 +55,7 @@ gauges = {
  }
  while True:
  - print("Retrieving data for {} nodes from {}".format(num_nodes, sock_addr))
  + print("Retrieving data for from {}".format(sock_addr))
  try:
  proxy = client.ServerProxy(
  