Zipkin
One of the earliest open-source distributed tracing systems, still widely deployed and broadly compatible.
Last updated
Zipkin is one of the original open-source distributed tracing systems, started at Twitter and modeled on Google’s Dapper paper. It collects timing data from services to help troubleshoot latency problems, storing traces in a backend of your choice (Elasticsearch, Cassandra, or plain in-memory/MySQL for smaller setups) and visualizing them in its own web UI.
It predates OpenTelemetry, but the Zipkin wire format (B3 propagation headers) is still widely supported across tracing libraries and is one of the export formats the OpenTelemetry Collector supports natively, which keeps it relevant in mixed or legacy environments.
Visit the official site for setup guides and current backend support.