public com.google.cloud.memorystore.v1.CrossInstanceReplicationConfig.RemoteInstanceOrBuilder
        getPrimaryInstanceOrBuilder() {
      if (primaryInstanceBuilder_ != null) {
        return primaryInstanceBuilder_.getMessageOrBuilder();
      } else {
        return primaryInstance_ == null
            ? com.google.cloud.memorystore.v1.CrossInstanceReplicationConfig.RemoteInstance
                .getDefaultInstance()
            : primaryInstance_;
      }
    }
<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