diff --git a/metadata/V2/Controller.php b/metadata/V2/Controller.php
index dbf94ed..3ceb171 100644
--- a/metadata/V2/Controller.php
+++ b/metadata/V2/Controller.php
@@ -72,7 +72,7 @@ public static function initOnce() {
             "65627567676572aa0218476f6f676c652e436c6f75642e44656275676765" .
             "722e5632ca0218476f6f676c655c436c6f75645c44656275676765725c56" .
             "32620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/metadata/V2/Data.php b/metadata/V2/Data.php
index bdcc0eb..2937e84 100644
--- a/metadata/V2/Data.php
+++ b/metadata/V2/Data.php
@@ -113,7 +113,7 @@ public static function initOnce() {
             "01aa0218476f6f676c652e436c6f75642e44656275676765722e5632ca02" .
             "18476f6f676c655c436c6f75645c44656275676765725c5632620670726f" .
             "746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/metadata/V2/Debugger.php b/metadata/V2/Debugger.php
index b11960c..3e9bc84 100644
--- a/metadata/V2/Debugger.php
+++ b/metadata/V2/Debugger.php
@@ -101,7 +101,7 @@ public static function initOnce() {
             "676765722f76323b636c6f75646465627567676572aa0218476f6f676c65" .
             "2e436c6f75642e44656275676765722e5632ca0218476f6f676c655c436c" .
             "6f75645c44656275676765725c5632620670726f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/src/V2/Breakpoint/Action.php b/src/V2/Breakpoint/Action.php
index 5186650..5d6b5da 100644
--- a/src/V2/Breakpoint/Action.php
+++ b/src/V2/Breakpoint/Action.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Debugger\V2\Breakpoint;
 
+use UnexpectedValueException;
+
 /**
  * Actions that can be taken when a breakpoint hits.
  * Agents should reject breakpoints with unsupported or unknown action values.
@@ -27,6 +29,31 @@ class Action
      * Generated from protobuf enum <code>LOG = 1;</code>
      */
     const LOG = 1;
+
+    private static $valueToName = [
+        self::CAPTURE => 'CAPTURE',
+        self::LOG => 'LOG',
+    ];
+
+    public static function name($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/src/V2/Breakpoint/LogLevel.php b/src/V2/Breakpoint/LogLevel.php
index 6b20a83..29e4052 100644
--- a/src/V2/Breakpoint/LogLevel.php
+++ b/src/V2/Breakpoint/LogLevel.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Debugger\V2\Breakpoint;
 
+use UnexpectedValueException;
+
 /**
  * Log severity levels.
  *
@@ -29,6 +31,32 @@ class LogLevel
      * Generated from protobuf enum <code>ERROR = 2;</code>
      */
     const ERROR = 2;
+
+    private static $valueToName = [
+        self::INFO => 'INFO',
+        self::WARNING => 'WARNING',
+        self::ERROR => 'ERROR',
+    ];
+
+    public static function name($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/src/V2/StatusMessage/Reference.php b/src/V2/StatusMessage/Reference.php
index 851c2e6..e7ac49f 100644
--- a/src/V2/StatusMessage/Reference.php
+++ b/src/V2/StatusMessage/Reference.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Debugger\V2\StatusMessage;
 
+use UnexpectedValueException;
+
 /**
  * Enumerates references to which the message applies.
  *
@@ -53,6 +55,36 @@ class Reference
      * Generated from protobuf enum <code>VARIABLE_VALUE = 6;</code>
      */
     const VARIABLE_VALUE = 6;
+
+    private static $valueToName = [
+        self::UNSPECIFIED => 'UNSPECIFIED',
+        self::BREAKPOINT_SOURCE_LOCATION => 'BREAKPOINT_SOURCE_LOCATION',
+        self::BREAKPOINT_CONDITION => 'BREAKPOINT_CONDITION',
+        self::BREAKPOINT_EXPRESSION => 'BREAKPOINT_EXPRESSION',
+        self::BREAKPOINT_AGE => 'BREAKPOINT_AGE',
+        self::VARIABLE_NAME => 'VARIABLE_NAME',
+        self::VARIABLE_VALUE => 'VARIABLE_VALUE',
+    ];
+
+    public static function name($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/src/V2/Variable.php b/src/V2/Variable.php
index 08441af..472e30f 100644
--- a/src/V2/Variable.php
+++ b/src/V2/Variable.php
@@ -317,6 +317,22 @@ public function getVarTableIndex()
         return $this->var_table_index;
     }
 
+    /**
+     * Returns the unboxed value from <code>getVarTableIndex()</code>
+
+     * Reference to a variable in the shared variable table. More than
+     * one variable can reference the same variable in the table. The
+     * `var_table_index` field is an index into `variable_table` in Breakpoint.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Int32Value var_table_index = 4;</code>
+     * @return int|null
+     */
+    public function getVarTableIndexValue()
+    {
+        $wrapper = $this->getVarTableIndex();
+        return is_null($wrapper) ? null : $wrapper->getValue();
+    }
+
     /**
      * Reference to a variable in the shared variable table. More than
      * one variable can reference the same variable in the table. The
@@ -334,6 +350,23 @@ public function setVarTableIndex($var)
         return $this;
     }
 
+    /**
+     * Sets the field by wrapping a primitive type in a Google\Protobuf\Int32Value object.
+
+     * Reference to a variable in the shared variable table. More than
+     * one variable can reference the same variable in the table. The
+     * `var_table_index` field is an index into `variable_table` in Breakpoint.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Int32Value var_table_index = 4;</code>
+     * @param int|null $var
+     * @return $this
+     */
+    public function setVarTableIndexValue($var)
+    {
+        $wrappedVar = is_null($var) ? null : new \Google\Protobuf\Int32Value(['value' => $var]);
+        return $this->setVarTableIndex($wrappedVar);
+    }
+
     /**
      * Status associated with the variable. This field will usually stay
      * unset. A status of a single variable only applies to that variable or
diff --git a/synth.metadata b/synth.metadata
index 26eb0d5..70e3efd 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-03-28T09:59:59.062664Z",
+  "updateTime": "2019-03-29T09:59:52.525827Z",
   "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": "37386f1ebcaed51bcb7d15d00124d22c38606e45",
+        "internalRef": "240841842"
       }
     }
   ],