Upgrading go.opentelemetry.io/otel 0.20 to 1

WithEndpointURL in otlpmetrichttp no longer appends the default signal path when the endpoint URL has no path; the root path is used instead.

Removes Kind, Value, KeyValue, their constructors, and attribute conversion helpers from go.opentelemetry.io/otel/log.

Removes AttributeValueLengthLimit and AttributeCountLimit fields from RecordFactory in sdk/log/logtest; records now keep attribute limits disabled.

Removes attribute limit fields from RecordFactory in sdk/log/logtest.

sdk/metric now applies a default cardinality limit of 2000; new attribute sets beyond it are dropped and aggregated into otel.metric.overflow.

Prometheus exporter drops the scope attributes name, version and schema_url.

Prometheus exporter now emits NewInvalidMetric for dropped data, causing scrapes to fail with HTTP 500 by default.

Removes the otel_scope_info metric from the go.opentelemetry.io/otel/exporters/prometheus exporter.

Removes otel_scope_info from the Prometheus exporter.

Removes the Resource field from EnabledParameters in the sdk/log package.

Removes ScopeRecords, EmittedRecord, and RecordFactory types from the logtest package.

Removes AssertRecordEqual from logtest; use AssertEqual instead.

Removes EnabledParameters.Resource from sdk/log.

Removes RecordFactory from log/logtest.

Adds AssertEqual and removes AssertRecordEqual from log/logtest.

Removes all examples under go.opentelemetry.io/otel/example, which moved to the Contrib repository.

The Record type in go.opentelemetry.io/otel/log is no longer comparable.

Renames SampledFilter to TraceBasedFilter.

The Processor interface in go.opentelemetry.io/otel/sdk/log no longer includes the Enabled method.

The SimpleProcessor type in go.opentelemetry.io/otel/sdk/log is no longer comparable.

The BatchProcessor type in go.opentelemetry.io/otel/sdk/log is no longer comparable.

Removes the Enabled method of SimpleProcessor in the sdk/log package.

Removes the Enabled method of BatchProcessor in the sdk/log package.

Removes zeroInstrumentKind.

Removes the deprecated go.opentelemetry.io/otel/bridge/opencensus.NewTracer.

Removes the deprecated go.opentelemetry.io/otel/exporters/otlp/otlpmetric module.

Removes the deprecated go.opentelemetry.io/otel/example/view module.

Removes the deprecated go.opentelemetry.io/otel/example/fib module.

Removes the experimental OTEL_GO_X_METRIC_EXPORT_BATCH_SIZE environment variable from the metric SDK.

Uses attribute.Value and attribute.KeyValue for log bodies and attributes in go.opentelemetry.io/otel/log, logtest, sdk/log, and sdk/log/logtest.

Returns spec-compliant TraceIdRatioBased description, a breaking behavioral change needed for spec compliance.

Moves the Enabled method from FilterProcessor to Processor in sdk/log.

Record.Resource now returns *resource.Resource instead of resource.Resource in go.opentelemetry.io/otel/sdk/log.

Changes sdk/log Record.Resource to return *resource.Resource.

Changes EnabledParameters to have a Severity field instead of a getter and setter in go.opentelemetry.io/otel/log.

Changes EnabledParameters to use a field instead of a getter and setter.

Logger.Enabled in go.opentelemetry.io/otel/log now accepts the new EnabledParameters type instead of Record.

Makes log.Record not comparable.

Processor.OnEmit in go.opentelemetry.io/otel/sdk/log now accepts a pointer to Record instead of a value.

Moves log.Processor.Enabled to an independent FilterProcessor interface type.

Trace API interfaces TracerProvider, Tracer, and Span now embed types from the new trace/embedded package, breaking custom implementations.

The trace TracerProvider interface now embeds embedded.TracerProvider, breaking existing implementations.

The Tracer interface in go.opentelemetry.io/otel/trace now embeds embedded.Tracer, breaking existing implementations.

The Span interface in go.opentelemetry.io/otel/trace now embeds embedded.Span, breaking existing implementations.

FilterProcessor.Enabled in go.opentelemetry.io/otel/sdk/log/internal/x now accepts EnabledParameters instead of Record.

Prevent panics in bridge/opentracing when OpenTracing baggage is propagated concurrently with Span.SetBaggageItem.

Closes schema files opened by ParseFile in schema/v1.0 and schema/v1.1 to fix a resource leak advisory.

Limits HTTP response body to 4 MiB in otlptracehttp to mitigate excessive memory usage; larger responses are non-retryable errors.

Updates google.golang.org/grpc to v1.79.3 as a security fix.

Opentelemetry-go's baggage parsing no longer caps raw header length in go.opentelemetry.io/otel

OpenTelemetry-Go: Multi-value baggage header extraction causes excessive allocations in go.opentelemetry.io/otel

Updates module golang.org/x/crypto to v0.45.0.

Updates all dependencies to address GO-2024-2687.

This release is the last to support Go 1.25; the next release will require at least Go 1.26.

Adds support for Go 1.27.

Drops support for Go 1.24.

This release is the last to support Go 1.24; the next release will require at least Go 1.25.

Adds support for Go 1.26.

Drops support for Go 1.23.

This release is the last to support Go 1.23; the next release will require at least Go 1.24.

Adds support for Go 1.25.

Drops support for Go 1.22.

This is the last release to support Go 1.22; the next release will require at least Go 1.23.

Adds support for Go 1.24.

Relaxes the minimum Go version to 1.22.0 in various modules.

Downgrades the minimum Go version dependency back to 1.22.0 in various packages.

Drops support for Go 1.21.

Drops support for Go 1.21 in the dice example.

This release is the last to support Go 1.21; the next release will require at least Go 1.22.

Adds support for Go 1.23.

Drops support for Go 1.20.

This release is the last to support Go 1.20; the next release will require at least Go 1.21.

Adds support for Go 1.22.

Deprecates WithExportBufferSize in sdk/log; the option remains for source compatibility but no longer affects behavior.

Deprecates the Value.Emit method in attribute; use Value.String instead.

Deprecates INVALID in attribute; use EMPTY instead.

Deprecates go.opentelemetry.io/otel/exporters/zipkin.

Deprecates the zipkin exporter.

Deprecates the WithoutUnits and WithoutCounterSuffixes options in favor of WithTranslationStrategy.

Deprecates the OTEL_GO_X_CARDINALITY_LIMIT environment variable in sdk/metric in favor of the WithCardinalityLimit option.

Deprecates the sdk/metric/x feature supporting cardinality limits.

Deprecates support for model.LegacyValidation in the Prometheus exporter.

Deprecates all examples under go.opentelemetry.io/otel/example as they move to the Contrib repository.

Deprecates examples and redirects to contrib.

Deprecates the attribute.Sortable type.

Deprecates the attribute.NewSetWithSortable function.

Deprecates the attribute.NewSetWithSortableFiltered function.

Deprecates opencensus.NewTracer in favor of opencensus.InstallTraceBridge.

Deprecates the example/fib package in favor of example/dice.

Deprecates trace.NewNoopTracerProvider in favor of the new NewTracerProvider function in trace/noop.

Deprecates the example/view package in favor of example/prometheus.

Deprecates the otlpmetric exporter package.