statsite

Implemented in C with an event loop architecture, enabling efficient handling of hundreds of connections and millions of metrics per second, as noted in the README's emphasis on speed and scalability.

Uses streaming algorithms like Cormode-Muthukrishnan for approximate timer percentiles and HyperLogLog for set cardinalities, minimizing memory usage while maintaining configurable accuracy.

Supports built-in sinks for Graphite, InfluxDB, and others, plus any custom executable via stdin, allowing metrics to be forwarded to virtually any backend system.

Fully compatible with Etsy's StatsD protocol, making migration seamless for existing StatsD users while offering enhanced performance in C.