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Add caveat about installing opencensus bridge (#1983)

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David Ashpole 2021-06-09 12:50:39 -04:00 committed by GitHub
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bridge/opencensus/README.md
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The OpenCensus Bridge helps facilitate the migration of an application from OpenCensus to OpenTelemetry.
## Caveat about OpenCensus
Installing a metric or tracing bridge will cause OpenCensus telemetry to be exported by OpenTelemetry exporters. Since OpenCensus telemetry uses globals, installing a bridge will result in telemetry collection from _all_ libraries that use OpenCensus, including some you may not expect. For example ([#1928](https://github.com/open-telemetry/opentelemetry-go/issues/1928)), if a client library generates traces with OpenCensus, installing the bridge will cause those traces to be exported by OpenTelemetry.
## Tracing
### The Problem: Mixing OpenCensus and OpenTelemetry libraries