presto-main/src/main/java/io/prestosql/metadata/DiscoveryNodeManager.java/DiscoveryNodeManager/getNodeVersion
class DiscoveryNodeManager:    private static NodeVersion getNodeVersion(ServiceDescriptor descriptor)
    {
        String nodeVersion = descriptor.getProperties().get("node_version");
        return nodeVersion == null ? null : new NodeVersion(nodeVersion);
    }