Revert of Add field_specs to all metrics in luci-py

client/third_party/infra_libs/logs/logs.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Utilities for logging.
 
 Example usage:
 
 .. code-block:: python
 
@@ skipping 23 matching lines @@
 import logging.handlers
 import os
 import re
 import socket
 import sys
 import tempfile
 import textwrap
 
 import pytz
 
-from infra_libs.ts_mon.common import metrics
+from infra_libs.ts_mon.common.metrics import CumulativeMetric
 
-log_metric = metrics.CumulativeMetric(
-    'proc/log_lines',
-    'Number of log lines, per severity level.',
-    [metrics.StringField('level')])
+log_metric = CumulativeMetric(
+  'proc/log_lines', description="Number of log lines, per severity level.")
 
 if sys.platform.startswith('win'):  # pragma: no cover
   DEFAULT_LOG_DIRECTORIES = os.pathsep.join([
       'E:\\chrome-infra-logs',
       'C:\\chrome-infra-logs',
   ])
 else:
   DEFAULT_LOG_DIRECTORIES = '/var/log/chrome-infra'
 
 
@@ skipping 228 matching lines @@
   for level in file_levels:
     add_handler(
         logger,
         handler=logging.handlers.RotatingFileHandler(
             filename=os.path.join(
                 logs_directory, pattern % logging.getLevelName(level)),
             maxBytes=10 * 1024 * 1024,
             backupCount=10,
             delay=True),
         level=level)