### Added

- Add `go.opentelemetry.io/otel/sdk/metric/exemplar.AlwaysOffFilter`,
which can be used to disable exemplar recording. (#5850)
- Add `go.opentelemetry.io/otel/sdk/metric.WithExemplarFilter`, which
can be used to configure the exemplar filter used by the metrics SDK.
(#5850)
- Add `ExemplarReservoirProviderSelector` and
`DefaultExemplarReservoirProviderSelector` to
`go.opentelemetry.io/otel/sdk/metric`, which defines the exemplar
reservoir to use based on the aggregation of the metric. (#5861)
- Add `ExemplarReservoirProviderSelector` to
`go.opentelemetry.io/otel/sdk/metric.Stream` to allow using views to
configure the exemplar reservoir to use for a metric. (#5861)
- Add `ReservoirProvider`, `HistogramReservoirProvider` and
`FixedSizeReservoirProvider` to
`go.opentelemetry.io/otel/sdk/metric/exemplar` to make it convenient to
use providers of Reservoirs. (#5861)
- The `go.opentelemetry.io/otel/semconv/v1.27.0` package.
The package contains semantic conventions from the `v1.27.0` version of
the OpenTelemetry Semantic Conventions. (#5894)
- Add `Attributes attribute.Set` field to `Scope` in
`go.opentelemetry.io/otel/sdk/instrumentation`. (#5903)
- Add `Attributes attribute.Set` field to `ScopeRecords` in
`go.opentelemetry.io/otel/log/logtest`. (#5927)
- `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc` adds
instrumentation scope attributes. (#5934)
- `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp` adds
instrumentation scope attributes. (#5934)
- `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc`
adds instrumentation scope attributes. (#5935)
- `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp`
adds instrumentation scope attributes. (#5935)
- `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc` adds
instrumentation scope attributes. (#5933)
- `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp` adds
instrumentation scope attributes. (#5933)
- `go.opentelemetry.io/otel/exporters/prometheus` adds instrumentation
scope attributes in `otel_scope_info` metric as labels. (#5932)

### Changed

- Support scope attributes and make them as identifying for `Tracer` in
`go.opentelemetry.io/otel` and `go.opentelemetry.io/otel/sdk/trace`.
(#5924)
- Support scope attributes and make them as identifying for `Meter` in
`go.opentelemetry.io/otel` and `go.opentelemetry.io/otel/sdk/metric`.
(#5926)
- Support scope attributes and make them as identifying for `Logger` in
`go.opentelemetry.io/otel` and `go.opentelemetry.io/otel/sdk/log`.
(#5925)
- Make schema URL and scope attributes as identifying for `Tracer` in
`go.opentelemetry.io/otel/bridge/opentracing`. (#5931)
- Clear unneeded slice elements to allow GC to collect the objects in
`go.opentelemetry.io/otel/sdk/metric` and
`go.opentelemetry.io/otel/sdk/trace`. (#5804)

### Fixed

- Global MeterProvider registration unwraps global instrument Observers,
the undocumented Unwrap() methods are now private. (#5881)
- `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc`
now keeps the metadata already present in the context when `WithHeaders`
is used. (#5892)
- `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc` now
keeps the metadata already present in the context when `WithHeaders` is
used. (#5911)
- `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc` now
keeps the metadata already present in the context when `WithHeaders` is
used. (#5915)
- Fix `go.opentelemetry.io/otel/exporters/prometheus` trying to add
exemplars to Gauge metrics, which is unsupported. (#5912)
- Fix `WithEndpointURL` to always use a secure connection when an https
URL is passed in
`go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc`.
(#5944)
- Fix `WithEndpointURL` to always use a secure connection when an https
URL is passed in
`go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp`.
(#5944)
- Fix `WithEndpointURL` to always use a secure connection when an https
URL is passed in
`go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc`.
(#5944)
- Fix `WithEndpointURL` to always use a secure connection when an https
URL is passed in
`go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp`.
(#5944)
- Fix incorrect metrics generated from callbacks when multiple readers
are used in `go.opentelemetry.io/otel/sdk/metric`. (#5900)

### Removed

- Remove all examples under `go.opentelemetry.io/otel/example` as they
are moved to [Contrib
repository](https://github.com/open-telemetry/opentelemetry-go-contrib/tree/main/examples).
(#5930)