diff --git a/Monitoring/metadata/V3/Alert.php b/Monitoring/metadata/V3/Alert.php
index 2e0a701bd4c8..29347f288bbf 100644
--- a/Monitoring/metadata/V3/Alert.php
+++ b/Monitoring/metadata/V3/Alert.php
@@ -87,7 +87,7 @@ public static function initOnce() {
             "69746f72696e672f76333b6d6f6e69746f72696e67aa021a476f6f676c65" .
             "2e436c6f75642e4d6f6e69746f72696e672e5633ca021a476f6f676c655c" .
             "436c6f75645c4d6f6e69746f72696e675c5633620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/AlertService.php b/Monitoring/metadata/V3/AlertService.php
index 20e6c3274ced..b39317f644ca 100644
--- a/Monitoring/metadata/V3/AlertService.php
+++ b/Monitoring/metadata/V3/AlertService.php
@@ -76,7 +76,7 @@ public static function initOnce() {
             "72696e672f76333b6d6f6e69746f72696e67aa021a476f6f676c652e436c" .
             "6f75642e4d6f6e69746f72696e672e5633ca021a476f6f676c655c436c6f" .
             "75645c4d6f6e69746f72696e675c5633620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/Common.php b/Monitoring/metadata/V3/Common.php
index 28287ba488a0..31eba26ad5f6 100644
--- a/Monitoring/metadata/V3/Common.php
+++ b/Monitoring/metadata/V3/Common.php
@@ -80,7 +80,7 @@ public static function initOnce() {
             "3b6d6f6e69746f72696e67aa021a476f6f676c652e436c6f75642e4d6f6e" .
             "69746f72696e672e5633ca021a476f6f676c655c436c6f75645c4d6f6e69" .
             "746f72696e675c5633620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/DroppedLabels.php b/Monitoring/metadata/V3/DroppedLabels.php
index 7a222fd83354..f24daef58011 100644
--- a/Monitoring/metadata/V3/DroppedLabels.php
+++ b/Monitoring/metadata/V3/DroppedLabels.php
@@ -27,7 +27,7 @@ public static function initOnce() {
             "746f50015a3e676f6f676c652e676f6c616e672e6f72672f67656e70726f" .
             "746f2f676f6f676c65617069732f6d6f6e69746f72696e672f76333b6d6f" .
             "6e69746f72696e67620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/Group.php b/Monitoring/metadata/V3/Group.php
index 7a5fb4893b01..21a980d38454 100644
--- a/Monitoring/metadata/V3/Group.php
+++ b/Monitoring/metadata/V3/Group.php
@@ -27,7 +27,7 @@ public static function initOnce() {
             "1a476f6f676c652e436c6f75642e4d6f6e69746f72696e672e5633ca021a" .
             "476f6f676c655c436c6f75645c4d6f6e69746f72696e675c563362067072" .
             "6f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/GroupService.php b/Monitoring/metadata/V3/GroupService.php
index 8e3fdfda30e1..5e89212b190b 100644
--- a/Monitoring/metadata/V3/GroupService.php
+++ b/Monitoring/metadata/V3/GroupService.php
@@ -88,7 +88,7 @@ public static function initOnce() {
             "6f6f676c652e436c6f75642e4d6f6e69746f72696e672e5633ca021a476f" .
             "6f676c655c436c6f75645c4d6f6e69746f72696e675c5633620670726f74" .
             "6f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/Metric.php b/Monitoring/metadata/V3/Metric.php
index f72ee8cc5915..f6e32739826b 100644
--- a/Monitoring/metadata/V3/Metric.php
+++ b/Monitoring/metadata/V3/Metric.php
@@ -47,7 +47,7 @@ public static function initOnce() {
             "6f72696e67aa021a476f6f676c652e436c6f75642e4d6f6e69746f72696e" .
             "672e5633ca021a476f6f676c655c436c6f75645c4d6f6e69746f72696e67" .
             "5c5633620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/MetricService.php b/Monitoring/metadata/V3/MetricService.php
index d3daaead48c4..da327d15c1c4 100644
--- a/Monitoring/metadata/V3/MetricService.php
+++ b/Monitoring/metadata/V3/MetricService.php
@@ -133,7 +133,7 @@ public static function initOnce() {
             "2f76333b6d6f6e69746f72696e67aa021a476f6f676c652e436c6f75642e" .
             "4d6f6e69746f72696e672e5633ca021a476f6f676c655c436c6f75645c4d" .
             "6f6e69746f72696e675c5633620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/MutationRecord.php b/Monitoring/metadata/V3/MutationRecord.php
index 36abc86fa6ae..5df510f24c52 100644
--- a/Monitoring/metadata/V3/MutationRecord.php
+++ b/Monitoring/metadata/V3/MutationRecord.php
@@ -28,7 +28,7 @@ public static function initOnce() {
             "6e67aa021a476f6f676c652e436c6f75642e4d6f6e69746f72696e672e56" .
             "33ca021a476f6f676c655c436c6f75645c4d6f6e69746f72696e675c5633" .
             "620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/Notification.php b/Monitoring/metadata/V3/Notification.php
index 8c8af782a43c..7e69a00d8ef8 100644
--- a/Monitoring/metadata/V3/Notification.php
+++ b/Monitoring/metadata/V3/Notification.php
@@ -57,7 +57,7 @@ public static function initOnce() {
             "72696e67aa021a476f6f676c652e436c6f75642e4d6f6e69746f72696e67" .
             "2e5633ca021a476f6f676c655c436c6f75645c4d6f6e69746f72696e675c" .
             "5633620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/NotificationService.php b/Monitoring/metadata/V3/NotificationService.php
index 6a117d25403b..00f0bb169582 100644
--- a/Monitoring/metadata/V3/NotificationService.php
+++ b/Monitoring/metadata/V3/NotificationService.php
@@ -150,7 +150,7 @@ public static function initOnce() {
             "746f72696e67aa021a476f6f676c652e436c6f75642e4d6f6e69746f7269" .
             "6e672e5633ca021a476f6f676c655c436c6f75645c4d6f6e69746f72696e" .
             "675c5633620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/SpanContext.php b/Monitoring/metadata/V3/SpanContext.php
index 2f55b4b770e3..7a1cfcafab43 100644
--- a/Monitoring/metadata/V3/SpanContext.php
+++ b/Monitoring/metadata/V3/SpanContext.php
@@ -25,7 +25,7 @@ public static function initOnce() {
             "696e67aa021a476f6f676c652e436c6f75642e4d6f6e69746f72696e672e" .
             "5633ca021a476f6f676c655c436c6f75645c4d6f6e69746f72696e675c56" .
             "33620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/Uptime.php b/Monitoring/metadata/V3/Uptime.php
index 6fa0eeda1e15..c1e594124210 100644
--- a/Monitoring/metadata/V3/Uptime.php
+++ b/Monitoring/metadata/V3/Uptime.php
@@ -81,7 +81,7 @@ public static function initOnce() {
             "76333b6d6f6e69746f72696e67aa021a476f6f676c652e436c6f75642e4d" .
             "6f6e69746f72696e672e5633ca021a476f6f676c655c436c6f75645c4d6f" .
             "6e69746f72696e675c5633620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/metadata/V3/UptimeService.php b/Monitoring/metadata/V3/UptimeService.php
index c3b06af3fe5a..c9d0a91da0d4 100644
--- a/Monitoring/metadata/V3/UptimeService.php
+++ b/Monitoring/metadata/V3/UptimeService.php
@@ -94,7 +94,7 @@ public static function initOnce() {
             "3b6d6f6e69746f72696e67aa021a476f6f676c652e436c6f75642e4d6f6e" .
             "69746f72696e672e5633ca021a476f6f676c655c436c6f75645c4d6f6e69" .
             "746f72696e675c5633620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Monitoring/src/V3/Aggregation/Aligner.php b/Monitoring/src/V3/Aggregation/Aligner.php
index eaee3871ee89..b0c1bc46b4a2 100644
--- a/Monitoring/src/V3/Aggregation/Aligner.php
+++ b/Monitoring/src/V3/Aggregation/Aligner.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Monitoring\V3\Aggregation;
 
+use UnexpectedValueException;
+
 /**
  * The Aligner describes how to bring the data points in a single
  * time series into temporal alignment.
@@ -215,6 +217,48 @@ class Aligner
      * Generated from protobuf enum <code>ALIGN_PERCENT_CHANGE = 23;</code>
      */
     const ALIGN_PERCENT_CHANGE = 23;
+
+    private static $valueToName = [
+        self::ALIGN_NONE => 'ALIGN_NONE',
+        self::ALIGN_DELTA => 'ALIGN_DELTA',
+        self::ALIGN_RATE => 'ALIGN_RATE',
+        self::ALIGN_INTERPOLATE => 'ALIGN_INTERPOLATE',
+        self::ALIGN_NEXT_OLDER => 'ALIGN_NEXT_OLDER',
+        self::ALIGN_MIN => 'ALIGN_MIN',
+        self::ALIGN_MAX => 'ALIGN_MAX',
+        self::ALIGN_MEAN => 'ALIGN_MEAN',
+        self::ALIGN_COUNT => 'ALIGN_COUNT',
+        self::ALIGN_SUM => 'ALIGN_SUM',
+        self::ALIGN_STDDEV => 'ALIGN_STDDEV',
+        self::ALIGN_COUNT_TRUE => 'ALIGN_COUNT_TRUE',
+        self::ALIGN_COUNT_FALSE => 'ALIGN_COUNT_FALSE',
+        self::ALIGN_FRACTION_TRUE => 'ALIGN_FRACTION_TRUE',
+        self::ALIGN_PERCENTILE_99 => 'ALIGN_PERCENTILE_99',
+        self::ALIGN_PERCENTILE_95 => 'ALIGN_PERCENTILE_95',
+        self::ALIGN_PERCENTILE_50 => 'ALIGN_PERCENTILE_50',
+        self::ALIGN_PERCENTILE_05 => 'ALIGN_PERCENTILE_05',
+        self::ALIGN_PERCENT_CHANGE => 'ALIGN_PERCENT_CHANGE',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Monitoring/src/V3/Aggregation/Reducer.php b/Monitoring/src/V3/Aggregation/Reducer.php
index 8980a8822c0c..b7b3e3ffbd01 100644
--- a/Monitoring/src/V3/Aggregation/Reducer.php
+++ b/Monitoring/src/V3/Aggregation/Reducer.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Monitoring\V3\Aggregation;
 
+use UnexpectedValueException;
+
 /**
  * A Reducer describes how to aggregate data points from multiple
  * time series into a single time series.
@@ -138,6 +140,43 @@ class Reducer
      * Generated from protobuf enum <code>REDUCE_PERCENTILE_05 = 12;</code>
      */
     const REDUCE_PERCENTILE_05 = 12;
+
+    private static $valueToName = [
+        self::REDUCE_NONE => 'REDUCE_NONE',
+        self::REDUCE_MEAN => 'REDUCE_MEAN',
+        self::REDUCE_MIN => 'REDUCE_MIN',
+        self::REDUCE_MAX => 'REDUCE_MAX',
+        self::REDUCE_SUM => 'REDUCE_SUM',
+        self::REDUCE_STDDEV => 'REDUCE_STDDEV',
+        self::REDUCE_COUNT => 'REDUCE_COUNT',
+        self::REDUCE_COUNT_TRUE => 'REDUCE_COUNT_TRUE',
+        self::REDUCE_COUNT_FALSE => 'REDUCE_COUNT_FALSE',
+        self::REDUCE_FRACTION_TRUE => 'REDUCE_FRACTION_TRUE',
+        self::REDUCE_PERCENTILE_99 => 'REDUCE_PERCENTILE_99',
+        self::REDUCE_PERCENTILE_95 => 'REDUCE_PERCENTILE_95',
+        self::REDUCE_PERCENTILE_50 => 'REDUCE_PERCENTILE_50',
+        self::REDUCE_PERCENTILE_05 => 'REDUCE_PERCENTILE_05',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Monitoring/src/V3/AlertPolicy.php b/Monitoring/src/V3/AlertPolicy.php
index 6f29acc7d9f5..28f91f3ccd9b 100644
--- a/Monitoring/src/V3/AlertPolicy.php
+++ b/Monitoring/src/V3/AlertPolicy.php
@@ -403,6 +403,24 @@ public function getEnabled()
         return $this->enabled;
     }
 
+    /**
+     * Returns the unboxed value from <code>getEnabled()</code>
+
+     * Whether or not the policy is enabled. On write, the default interpretation
+     * if unset is that the policy is enabled. On read, clients should not make
+     * any assumption about the state if it has not been populated. The
+     * field should always be populated on List and Get operations, unless
+     * a field projection has been specified that strips it out.
+     *
+     * Generated from protobuf field <code>.google.protobuf.BoolValue enabled = 17;</code>
+     * @return bool|null
+     */
+    public function getEnabledValue()
+    {
+        $wrapper = $this->getEnabled();
+        return is_null($wrapper) ? null : $wrapper->getValue();
+    }
+
     /**
      * Whether or not the policy is enabled. On write, the default interpretation
      * if unset is that the policy is enabled. On read, clients should not make
@@ -422,6 +440,25 @@ public function setEnabled($var)
         return $this;
     }
 
+    /**
+     * Sets the field by wrapping a primitive type in a Google\Protobuf\BoolValue object.
+
+     * Whether or not the policy is enabled. On write, the default interpretation
+     * if unset is that the policy is enabled. On read, clients should not make
+     * any assumption about the state if it has not been populated. The
+     * field should always be populated on List and Get operations, unless
+     * a field projection has been specified that strips it out.
+     *
+     * Generated from protobuf field <code>.google.protobuf.BoolValue enabled = 17;</code>
+     * @param bool|null $var
+     * @return $this
+     */
+    public function setEnabledValue($var)
+    {
+        $wrappedVar = is_null($var) ? null : new \Google\Protobuf\BoolValue(['value' => $var]);
+        return $this->setEnabled($wrappedVar);
+    }
+
     /**
      * Identifies the notification channels to which notifications should be sent
      * when incidents are opened or closed or when new violations occur on
diff --git a/Monitoring/src/V3/AlertPolicy/ConditionCombinerType.php b/Monitoring/src/V3/AlertPolicy/ConditionCombinerType.php
index 0123d90cf008..45b2cbba3a00 100644
--- a/Monitoring/src/V3/AlertPolicy/ConditionCombinerType.php
+++ b/Monitoring/src/V3/AlertPolicy/ConditionCombinerType.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Monitoring\V3\AlertPolicy;
 
+use UnexpectedValueException;
+
 /**
  * Operators for combining conditions.
  *
@@ -41,6 +43,33 @@ class ConditionCombinerType
      * Generated from protobuf enum <code>AND_WITH_MATCHING_RESOURCE = 3;</code>
      */
     const AND_WITH_MATCHING_RESOURCE = 3;
+
+    private static $valueToName = [
+        self::COMBINE_UNSPECIFIED => 'COMBINE_UNSPECIFIED',
+        self::PBAND => 'PBAND',
+        self::PBOR => 'PBOR',
+        self::AND_WITH_MATCHING_RESOURCE => 'AND_WITH_MATCHING_RESOURCE',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Monitoring/src/V3/ComparisonType.php b/Monitoring/src/V3/ComparisonType.php
index abb843f14d36..443acd3388cf 100644
--- a/Monitoring/src/V3/ComparisonType.php
+++ b/Monitoring/src/V3/ComparisonType.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Monitoring\V3;
 
+use UnexpectedValueException;
+
 /**
  * Specifies an ordering relationship on two arguments, here called left and
  * right.
@@ -54,5 +56,35 @@ class ComparisonType
      * Generated from protobuf enum <code>COMPARISON_NE = 6;</code>
      */
     const COMPARISON_NE = 6;
+
+    private static $valueToName = [
+        self::COMPARISON_UNSPECIFIED => 'COMPARISON_UNSPECIFIED',
+        self::COMPARISON_GT => 'COMPARISON_GT',
+        self::COMPARISON_GE => 'COMPARISON_GE',
+        self::COMPARISON_LT => 'COMPARISON_LT',
+        self::COMPARISON_LE => 'COMPARISON_LE',
+        self::COMPARISON_EQ => 'COMPARISON_EQ',
+        self::COMPARISON_NE => 'COMPARISON_NE',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
diff --git a/Monitoring/src/V3/GroupResourceType.php b/Monitoring/src/V3/GroupResourceType.php
index 7b08ec497b07..ddf9d0eee1a8 100644
--- a/Monitoring/src/V3/GroupResourceType.php
+++ b/Monitoring/src/V3/GroupResourceType.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Monitoring\V3;
 
+use UnexpectedValueException;
+
 /**
  * The supported resource types that can be used as values of
  * `group_resource.resource_type`.
@@ -34,5 +36,31 @@ class GroupResourceType
      * Generated from protobuf enum <code>AWS_ELB_LOAD_BALANCER = 2;</code>
      */
     const AWS_ELB_LOAD_BALANCER = 2;
+
+    private static $valueToName = [
+        self::RESOURCE_TYPE_UNSPECIFIED => 'RESOURCE_TYPE_UNSPECIFIED',
+        self::INSTANCE => 'INSTANCE',
+        self::AWS_ELB_LOAD_BALANCER => 'AWS_ELB_LOAD_BALANCER',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
diff --git a/Monitoring/src/V3/ListTimeSeriesRequest/TimeSeriesView.php b/Monitoring/src/V3/ListTimeSeriesRequest/TimeSeriesView.php
index 5d641ced36d2..4055777eb6db 100644
--- a/Monitoring/src/V3/ListTimeSeriesRequest/TimeSeriesView.php
+++ b/Monitoring/src/V3/ListTimeSeriesRequest/TimeSeriesView.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Monitoring\V3\ListTimeSeriesRequest;
 
+use UnexpectedValueException;
+
 /**
  * Controls which fields are returned by `ListTimeSeries`.
  *
@@ -25,6 +27,31 @@ class TimeSeriesView
      * Generated from protobuf enum <code>HEADERS = 1;</code>
      */
     const HEADERS = 1;
+
+    private static $valueToName = [
+        self::FULL => 'FULL',
+        self::HEADERS => 'HEADERS',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Monitoring/src/V3/NotificationChannel.php b/Monitoring/src/V3/NotificationChannel.php
index 9106f0928a59..9e6a4bdba225 100644
--- a/Monitoring/src/V3/NotificationChannel.php
+++ b/Monitoring/src/V3/NotificationChannel.php
@@ -445,6 +445,25 @@ public function getEnabled()
         return $this->enabled;
     }
 
+    /**
+     * Returns the unboxed value from <code>getEnabled()</code>
+
+     * Whether notifications are forwarded to the described channel. This makes
+     * it possible to disable delivery of notifications to a particular channel
+     * without removing the channel from all alerting policies that reference
+     * the channel. This is a more convenient approach when the change is
+     * temporary and you want to receive notifications from the same set
+     * of alerting policies on the channel at some point in the future.
+     *
+     * Generated from protobuf field <code>.google.protobuf.BoolValue enabled = 11;</code>
+     * @return bool|null
+     */
+    public function getEnabledValue()
+    {
+        $wrapper = $this->getEnabled();
+        return is_null($wrapper) ? null : $wrapper->getValue();
+    }
+
     /**
      * Whether notifications are forwarded to the described channel. This makes
      * it possible to disable delivery of notifications to a particular channel
@@ -465,5 +484,25 @@ public function setEnabled($var)
         return $this;
     }
 
+    /**
+     * Sets the field by wrapping a primitive type in a Google\Protobuf\BoolValue object.
+
+     * Whether notifications are forwarded to the described channel. This makes
+     * it possible to disable delivery of notifications to a particular channel
+     * without removing the channel from all alerting policies that reference
+     * the channel. This is a more convenient approach when the change is
+     * temporary and you want to receive notifications from the same set
+     * of alerting policies on the channel at some point in the future.
+     *
+     * Generated from protobuf field <code>.google.protobuf.BoolValue enabled = 11;</code>
+     * @param bool|null $var
+     * @return $this
+     */
+    public function setEnabledValue($var)
+    {
+        $wrappedVar = is_null($var) ? null : new \Google\Protobuf\BoolValue(['value' => $var]);
+        return $this->setEnabled($wrappedVar);
+    }
+
 }
 
diff --git a/Monitoring/src/V3/NotificationChannel/VerificationStatus.php b/Monitoring/src/V3/NotificationChannel/VerificationStatus.php
index 12df1b11799f..2b70fa842873 100644
--- a/Monitoring/src/V3/NotificationChannel/VerificationStatus.php
+++ b/Monitoring/src/V3/NotificationChannel/VerificationStatus.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Monitoring\V3\NotificationChannel;
 
+use UnexpectedValueException;
+
 /**
  * Indicates whether the channel has been verified or not. It is illegal
  * to specify this field in a
@@ -41,6 +43,32 @@ class VerificationStatus
      * Generated from protobuf enum <code>VERIFIED = 2;</code>
      */
     const VERIFIED = 2;
+
+    private static $valueToName = [
+        self::VERIFICATION_STATUS_UNSPECIFIED => 'VERIFICATION_STATUS_UNSPECIFIED',
+        self::UNVERIFIED => 'UNVERIFIED',
+        self::VERIFIED => 'VERIFIED',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Monitoring/src/V3/ServiceTier.php b/Monitoring/src/V3/ServiceTier.php
index 232e88e917e6..36bc80c2aed7 100644
--- a/Monitoring/src/V3/ServiceTier.php
+++ b/Monitoring/src/V3/ServiceTier.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Monitoring\V3;
 
+use UnexpectedValueException;
+
 /**
  * The tier of service for a Workspace. Please see the
  * [service tiers
@@ -41,5 +43,31 @@ class ServiceTier
      * Generated from protobuf enum <code>SERVICE_TIER_PREMIUM = 2;</code>
      */
     const SERVICE_TIER_PREMIUM = 2;
+
+    private static $valueToName = [
+        self::SERVICE_TIER_UNSPECIFIED => 'SERVICE_TIER_UNSPECIFIED',
+        self::SERVICE_TIER_BASIC => 'SERVICE_TIER_BASIC',
+        self::SERVICE_TIER_PREMIUM => 'SERVICE_TIER_PREMIUM',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
diff --git a/Monitoring/src/V3/UptimeCheckRegion.php b/Monitoring/src/V3/UptimeCheckRegion.php
index ecca47e8317a..c70f31fdbefd 100644
--- a/Monitoring/src/V3/UptimeCheckRegion.php
+++ b/Monitoring/src/V3/UptimeCheckRegion.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Monitoring\V3;
 
+use UnexpectedValueException;
+
 /**
  * The regions from which an uptime check can be run.
  *
@@ -44,5 +46,33 @@ class UptimeCheckRegion
      * Generated from protobuf enum <code>ASIA_PACIFIC = 4;</code>
      */
     const ASIA_PACIFIC = 4;
+
+    private static $valueToName = [
+        self::REGION_UNSPECIFIED => 'REGION_UNSPECIFIED',
+        self::USA => 'USA',
+        self::EUROPE => 'EUROPE',
+        self::SOUTH_AMERICA => 'SOUTH_AMERICA',
+        self::ASIA_PACIFIC => 'ASIA_PACIFIC',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
diff --git a/Monitoring/synth.metadata b/Monitoring/synth.metadata
index 249167115cfd..71199ce4f978 100644
--- a/Monitoring/synth.metadata
+++ b/Monitoring/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-03-28T10:02:26.522025Z",
+  "updateTime": "2019-03-30T10:01:57.072926Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.20",
-        "dockerImage": "googleapis/artman@sha256:e3c054a2fb85a12481c722af616c7fb6f1d02d862248385eecbec3e4240ebd1e"
+        "version": "0.16.21",
+        "dockerImage": "googleapis/artman@sha256:854131ec1af7b3a313253474c24748dc0acd217a58a0b74dbfb559f340a15d78"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "6a84b3267b0a95e922608b9891219075047eee29",
-        "internalRef": "240640999"
+        "sha": "fd67be4b51a8c809b97100ccf1c3cffd15b85d7b",
+        "internalRef": "241096997"
       }
     }
   ],