This is a data packet broker (middleware) which is typically deployed as a stateful set. It supports two use cases as shown in the diagram.
On the left, it acts as buffer for when an individual transport experiences a backfill event. In this case, the number of read data packets typically spikes. On the right, it acts as an aggregation point for various import mechanisms so that downstream consumers can point to a single service for seismic data packets. If handling backfill spikes is not a concern, then one data packet broker is sufficient that acts as a common aggregation point, a single service subsequent packets, and a buffer for data surges.