What is it
OpenCensus is a cross-platform and cross-language project for easily collecting telemetry like metrics and distributed traces from services.
Why hold it
A stable version of the tracing SDK was released in September 2021. However, the metrics SDK is still unstable and many applications still actively use the OpenCensus metrics SDK for instrumentation.
The current recommendation is to prefer OpenTelemetry when possible, but to fall back to OpenCensus and use the OpenCensus bridge to export metrics via the OpenTelemetry exporters.