public com.google.cloud.memorystore.v1.CrossInstanceReplicationConfig.RemoteInstance.Builder
        getPrimaryInstanceBuilder() {
      bitField0_ |= 0x00000002;
      onChanged();
      return getPrimaryInstanceFieldBuilder().getBuilder();
    }
<pre>
Optional. Details of the primary instance that is used as the replication
source for this secondary instance.

This field is only set for a secondary instance.
</pre>

<code>
.google.cloud.memorystore.v1.CrossInstanceReplicationConfig.RemoteInstance primary_instance = 2 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/CrossInstanceReplicationConfig.java