[blog] Announce JS SDK 2.0

content/en/blog/2025/otel-js-sdk-2-0.md

@@ -0,0 +1,91 @@
+---
+title: Announcing the OpenTelemetry JavaScript SDK 2.0
+linkTitle: OTel JS SDK 2.0
+date: 2025-03-26
+author: >
+  [Jamie Danielson](https://github.com/JamieDanielson) (Honeycomb)
+sig: OpenTelemetry JS
+cSpell:ignore: Danielson
+---
+
+Exciting news: [OpenTelemetry JavaScript](/docs/languages/js/) has released [SDK
+2.0][v2.0.0]!
+
+[v2.0.0]: https://github.com/open-telemetry/opentelemetry-js/releases/tag/v2.0.0
+
+{{% alert-md title="Migration guide" color="info" %}}
+
+For a detailed description of breaking changes, see the **migration guide**:
+[Upgrade to OpenTelemetry JS SDK 2.x][migration guide].
+
+[migration guide]:
+  https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md
+
+{{% /alert-md %}}
+
+## What is JS SDK 2.x?
+
+JS SDK 2.x encompasses new releases of the `@opentelemetry/*` JavaScript
+packages published from the
+[`opentelemetry-js` repository](https://github.com/open-telemetry/opentelemetry-js),
+except the API and semantic-conventions packages. The package versions for this
+new major will be `>=2.0.0` for the stable and `>=0.200.0` for the unstable
+packages. Details on the full list of packages can be found in the [migration
+guide][].
+
+## What has changed?
+
+In summary:
+
+- The **minimum supported Node.js has been raised to `^18.19.0 || >=20.6.0`**.
+  This means that support for Node.js 14 and 16 has been dropped.
+- The **minimum supported TypeScript version has been raised to 5.0.4**.
+- The **compilation target for transpiled TypeScript has been raised to ES2022**
+  (from ES2017).
+- The **public interface has changed**.
+  - For notes on migrating to 2.x / 0.200.x, see
+    [the upgrade guide](https://github.com/open-telemetry/opentelemetry-js/tree/main/doc/upgrade-to-2.x.md).
+
+Details:
+
+- [Node.js supported versions](https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md#-nodejs-supported-versions)
+- [TypeScript supported versions](https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md#-typescript-supported-versions)
+- [ES2022 compilation target](https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md#-es2022-compilation-target)
+- [Drop `window.OTEL_*` support in browsers](https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md#-drop-windowotel_-support-in-browsers)
+- [`@opentelemetry/resources` API changes](https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md#-opentelemetryresources-api-changes)
+- [`@opentelemetry/core` API changes](https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md#-opentelemetrycore-api-changes)
+- [Tracing SDK API changes](https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md#-tracing-sdk-api-changes)
+- [`@opentelemetry/sdk-metrics` API changes](https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md#-opentelemetrysdk-metrics-api-changes)
+- [`@opentelemetry/resources` changes for _implementors_ of Resource Detectors](https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md#-opentelemetryresources-changes-for-implementors-of-resource-detectors)
+- [Other changes](https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md#-other-changes)
+
+## Why was this done?
+
+We knew we would gain the greatest benefit by allowing breaking changes to
+improve things related to:
+
+- Optimization: removing classes and namespaces to allow better minification and
+  tree-shaking.
+- Better tooling and support: dropping old runtimes and tool versions to take
+  advantage of enhanced ESM support and simplify documentation.
+- Velocity: reducing code complexity and removing deprecated fields for faster
+  feature and maintenance work.
+
+This also begins our goal of releasing a new SDK major release every year.
+
+For a more detailed explanation of why 2.0, see issue [#4083].
+
+[#4083]: https://github.com/open-telemetry/opentelemetry-js/issues/4083
+
+## How can I get involved?
+
+[v0.200.0]:
+  https://github.com/open-telemetry/opentelemetry-js/releases/tag/experimental%2Fv0.200.0
+
+- Try out the [v2.0.0] and [v0.200.0] releases and provide feedback.
+- Review our
+  [contributing guide](https://github.com/open-telemetry/opentelemetry-js/blob/main/CONTRIBUTING.md)
+  for details on contributing.
+- Attend our
+  [SIG meetings](https://groups.google.com/a/opentelemetry.io/g/calendar-js).
+- Collaborate on [Slack](https://cloud-native.slack.com/archives/C01NL1GRPQR).

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