diff --git a/google/cloud/monitoring_v3/types/alert.py b/google/cloud/monitoring_v3/types/alert.py
index 4e16bf69..83120e2d 100644
--- a/google/cloud/monitoring_v3/types/alert.py
+++ b/google/cloud/monitoring_v3/types/alert.py
@@ -527,6 +527,10 @@ class AlertStrategy(proto.Message):
 
                 This limit is not implemented for alert policies that are
                 not log-based.
+            auto_close (google.protobuf.duration_pb2.Duration):
+                If an alert policy that was active has no
+                data for this long, any open incidents will
+                close
         """
 
         class NotificationRateLimit(proto.Message):
@@ -547,6 +551,9 @@ class NotificationRateLimit(proto.Message):
             number=1,
             message="AlertPolicy.AlertStrategy.NotificationRateLimit",
         )
+        auto_close = proto.Field(
+            proto.MESSAGE, number=3, message=duration_pb2.Duration,
+        )
 
     name = proto.Field(proto.STRING, number=1,)
     display_name = proto.Field(proto.STRING, number=2,)
diff --git a/google/cloud/monitoring_v3/types/common.py b/google/cloud/monitoring_v3/types/common.py
index 18b5c8bf..0c4b8c9c 100644
--- a/google/cloud/monitoring_v3/types/common.py
+++ b/google/cloud/monitoring_v3/types/common.py
@@ -128,7 +128,7 @@ class TimeInterval(proto.Message):
        the end time of the previous interval.
 
     -  For ``CUMULATIVE`` metrics, the start time and end time must
-       specify a a non-zero interval, with subsequent points specifying
+       specify a non-zero interval, with subsequent points specifying
        the same start time and increasing end times, until an event
        resets the cumulative value to zero and sets a new start time for
        the following points. The new start time must be at least a