public Builder setZoneDistributionConfig(
        com.google.cloud.memorystore.v1.ZoneDistributionConfig value) {
      if (zoneDistributionConfigBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        zoneDistributionConfig_ = value;
      } else {
        zoneDistributionConfigBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00080000;
      onChanged();
      return this;
    }
<pre>
Optional. Immutable. Zone distribution configuration of the instance for
node allocation.
</pre>

<code>
.google.cloud.memorystore.v1.ZoneDistributionConfig zone_distribution_config = 18 [(.google.api.field_behavior) = OPTIONAL, (.google.api.field_behavior) = IMMUTABLE];
</code>
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/Instance.java