public Builder setZone(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      zone_ = value;
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
Optional. Defines zone where all resources will be allocated with
SINGLE_ZONE mode. Ignored for MULTI_ZONE mode.
</pre>

<code>string zone = 2 [(.google.api.field_behavior) = OPTIONAL];</code>

@param value The zone to set.
@return This builder for chaining.
java-valkey/proto-google-cloud-valkey-v1beta/src/main/java/com/google/cloud/memorystore/v1beta/ZoneDistributionConfig.java