feat(subp): Measure subprocess command time

cloudinit/subp.py

@@ -5,6 +5,7 @@
 import logging
 import os
 import subprocess
+import time
 from errno import ENOEXEC
 from io import TextIOWrapper
 from typing import List, Union
@@ -277,6 +278,7 @@ def subp(
             x if isinstance(x, bytes) else x.encode("utf-8") for x in args
         ]
     try:
+        before = time.time()
         sp = subprocess.Popen(
             bytes_args,
             stdout=stdout,
@@ -287,6 +289,7 @@ def subp(
             cwd=cwd,
         )
         (out, err) = sp.communicate(data)
+        LOG.debug("command %s took %.3ss to run", args, time.time() - before)
     except OSError as e:
         if status_cb:
             status_cb("ERROR: End run command: invalid command provided\n")