Roll infra_libs and gae_ts_mon in luci-py, and add field_specs to all metrics

client/third_party/infra_libs/ts_mon/common/errors.py

 # Copyright 2015 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.
 
 """Classes representing errors that can be raised by the monitoring library."""
 
 
 class MonitoringError(Exception):
   """Base class for exceptions raised by this module."""
 
@@ skipping 107 matching lines @@
 
 
 class UnknownModificationTypeError(MonitoringError):
   """Raised when using a Modification with an unknown type value."""
 
   def __init__(self, mod_type):
     self.mod_type = mod_type
 
   def __str__(self):
     return 'Unknown modification type "%s"' % self.mod_type
+
+
+class MetricDefinitionError(MonitoringError):
+  """Raised when a metric was defined incorrectly."""
+
+
+class WrongFieldsError(MonitoringError):
+  """Raised when a metric is given different fields to its definition."""
+
+  def __init__(self, metric_name, got, expected):
+    self.metric_name = metric_name
+    self.got = got
+    self.expected = expected
+
+  def __str__(self):
+    return 'Metric "%s" is defined with %s fields but was given %s' % (
+        self.metric_name, self.expected, self.got)