Prometheus remote write protocol is used by Prometheus for sending data to remote storage systems such as VictoriaMetrics. The VictoriaMetrics remote write protocol allows reducing network traffic costs by 2x-4x comparing to the Prometheus remote write protocol at the cost of slightly higher CPU usage (+10% according to our production stats). vmagent automatically detects whether the configured remote storage supports VictoriaMetrics remote write protocol and uses this protocol instead of Prometheus remote write protocol for data transfer.