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OpenCensus provides in-process web pages that display collected data from the process that they are attached to. These are called “zPages”. They are useful to for in-process diagnostics without having to depend on any backend to examine traces or metrics.

zPages can be useful during the development time or when the process to be inspected is known in production.


The Tracez route is available to examine and bucketize spans by latency buckets for example

(0us, 10us, 100us, 1ms, 10ms, 100ms, 1s, 10s, 1m]

They also allow you to quickly examine error samples


The Rpcz route is available to help examine statistics of remote procedure calls (RPCs) that are are instrumented with OpenCensus. For example when using gRPC

Language implementations

zPages are supported for the following languages: