This means that agent is only collecting host and process metrics. There is no instrumentation for transactions tracking. It’s good when you have for example host that contains native processes that are not supported by DT. In such case you have at least some metrics in DT.
Another case is licensing. Cloud infrastructure mode consumes 0.3 of regular license. And max here is 1 host unit. So even host with 1T ram will consume max 1 license here.