Add "Sunsetting OpenCensus" blog post

content/en/blog/2023/sunsetting-opencensus.md

@@ -0,0 +1,77 @@
+---
+title: Sunsetting OpenCensus
+linkTitle: Sunsetting OpenCensus
+date: 2023-04-24 # Put the current date, we will keep the date updated until your PR is merged
+author: '[Aaron Abbott](https:/aabmass) (Google)'
+# draft: true # TODO: remove this line to publish on 2023-05-01
+---
+
+In 2019, we announced that OpenTracing and OpenCensus would be merging to form
+the OpenTelemetry project. From the start, we considered OpenTelemetry
+[to be the next major version of both OpenTracing and OpenCensus](https://www.cncf.io/blog/2019/05/21/a-brief-history-of-opentelemetry-so-far/).
+
+We are excited to announce that OpenTelemetry has reached feature parity with
+OpenCensus in C++, C#, Go, Java, JavaScript, PHP and Python.
+[Stable releases](/docs/instrumentation/#status-and-releases) of both the
+Tracing and Metrics SDKs are available in most of these languages with Go and
+PHP soon to follow. This means that OpenTelemetry can collect and export
+telemetry data with the same level of functionality as OpenCensus. Beyond that,
+OpenTelemetry offers a [richer ecosystem](/ecosystem) of instrumentation
+libraries and exporters, and an
+[active open source community](https://www.cncf.io/blog/2023/01/11/a-look-at-the-2022-velocity-of-cncf-linux-foundation-and-top-30-open-source-projects/).
+
+As a result, we will be archiving all OpenCensus Github repositories (with the
+exception of [census-instrumentation/opencensus-python][]) on July 31st, 2023.
+We are excited to see the
+[long term plan for OpenTelemetry](https://medium.com/opentracing/a-roadmap-to-convergence-b074e5815289)
+coming to fruition and encourage all users of OpenCensus to migrate to
+OpenTelemetry.
+
+## How to Migrate to OpenTelemetry
+
+One of the
+[key goals](https://medium.com/opentracing/merging-opentracing-and-opencensus-f0fe9c7ca6f0)
+of the OpenTelemetry project is to provide backward compatibility with
+OpenCensus and a migration story for existing users.
+
+To help ease the migration path, we have provided backward compatibility bridges
+in [Go][go shim], [Java][java shim], [Python][python shim], and
+JavaScript<!-- TODO: add link before publishing -->. Installing these bridges
+allows OpenCensus and OpenTelemetry instrumentation to smoothly interoperate,
+with all of your telemetry flowing out of OpenTelemetry exporters. This lets
+OpenCensus users incrementally transition all of their instrumentation from
+OpenCensus to OpenTelemetry, and finally remove OpenCensus libraries from their
+applications.
+
+While OpenTelemetry was never intended to be a strict superset of OpenCensus,
+most of the APIs and data models are compatible. Migration should be considered
+a "major version bump" and you may notice some changes in your telemetry.
+
+More details on what to expect and some suggested workflows for migration are
+outlined in the
+[compatibility specification](https://opentelemetry.io/docs/reference/specification/compatibility/opencensus/#migration-path).
+
+## What to Expect After July 31st, 2023
+
+After July 31st, 2023, the OpenCensus project will no longer be maintained. This
+means that there will be no new features added to the project, and any security
+vulnerabilities that are found will not be patched.
+
+However, the OpenCensus repositories will remain archived on GitHub. This means
+users will still be able to download the OpenCensus code and use it in their
+projects. Existing releases of OpenCensus will remain available in public
+package repositories like NPM and PyPI. **We encourage all OpenCensus users to
+migrate to OpenTelemetry as soon as possible.**
+
+One exception to this is the [census-instrumentation/opencensus-python], which
+will continue to be maintained until
+TBD<!-- TODO: add date before publishing-->.
+
+[go shim]:
+ https:/open-telemetry/opentelemetry-go/tree/main/bridge/opencensus
+[java shim]:
+ https:/open-telemetry/opentelemetry-java/tree/main/opencensus-shim
+[python shim]:
+ https:/open-telemetry/opentelemetry-python/tree/main/shim/opentelemetry-opencensus-shim
+[census-instrumentation/opencensus-python]:
+ https:/census-instrumentation/opencensus-python

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