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

appengine/machine_provider/metrics.py

 # Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Metrics to track with ts_mon and event_mon."""
 
 import gae_ts_mon
 
 
 lease_requests_deduped = gae_ts_mon.CounterMetric(
     'machine_provider/lease_requests/deduped',
-    description='Number of lease requests deduplicated.',
-)
+    'Number of lease requests deduplicated.',
+    None)
 
 
 lease_requests_expired = gae_ts_mon.CounterMetric(
     'machine_provider/lease_requests/expired',
-    description='Number of lease requests expired.',
-)
+    'Number of lease requests expired.',
+    None)
 
 
 lease_requests_fulfilled = gae_ts_mon.CounterMetric(
     'machine_provider/lease_requests/fulfilled',
-    description='Number of lease requests fulfilled.',
-)
+    'Number of lease requests fulfilled.',
+    None)
 
 
 lease_requests_received = gae_ts_mon.CounterMetric(
     'machine_provider/lease_requests/received',
-    description='Number of lease requests received.',
-)
+    'Number of lease requests received.',
+    None)
 
 
 pubsub_messages_sent = gae_ts_mon.CounterMetric(
     'machine_provider/pubsub_messages/sent',
-    description='Number of Pub/Sub messages sent.',
-)
+    'Number of Pub/Sub messages sent.',
+    [gae_ts_mon.StringField('target')])