What protocol does StatsD typically listen on?

StatsD typically listens on port 8125. This port is designed specifically for StatsD to receive metrics and events from applications and services. The choice of this port is not arbitrary; it was chosen because it allows StatsD to collect a variety of metrics using a simple UDP protocol, making it efficient for high-throughput data environments that need to relay metrics rapidly without the overhead of establishing a TCP connection.

Ports like 80 and 443 are reserved for HTTP and HTTPS traffic, which handle web communications, and are unsuitable for StatsD's purpose. Port 8080 is often used for alternative web traffic, but it doesn't align with the specific use case for StatsD either. Therefore, the correct option emphasizes the dedicated functionality provided by port 8125 for StatsD, distinguishing it from general web and alternative application communication ports.