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### Added
- Add environment variables propagation carrier in `go.opentelemetry.io/contrib/propagators/envcar`. (#8442)
### Changed
- Upgrade `go.opentelemetry.io/otel/semconv` to `v1.40.0`, including updates across instrumentation and detector modules. (#8631)
- The semantic conventions v1.40.0 release introduces RPC breaking changes applied in this repository:
- RPC spans and metrics no longer include `network.protocol.name`, `network.protocol.version`, or `network.transport` attributes.
- `rpc.client.request.size`, `rpc.client.response.size`, `rpc.server.request.size`, and `rpc.server.response.size` are no longer emitted in `go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc`.
- `rpc.message` span events and their message attributes are no longer emitted in `go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc` (including when `WithMessageEvents` is configured).
See [semantic-conventions v1.40.0 release](https://github.com/open-telemetry/semantic-conventions/releases/tag/v1.40.0) for complete details.
### Fixed
- Ignore informational response status codes (`100-199`) except `101 Switching Protocols` when storing the HTTP status code in `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp` and `go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux`. (#6913)
- Make `Body` handling in `Transport` consistent with stdlib in `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp`. (#8618)
- Fix bucket boundaries for `rpc.server.call.duration` and `rpc.client.call.duration` in `go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc`. (#8642)
- Host resource detector in `go.opentelemetry.io/contrib/otelconf` now includes `os.` attributes. (#8578)
### Removed
- Drop support for [Go 1.24]. (#8628)
[Go 1.24]: https://go.dev/doc/go1.24
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