1.0.0-RC3 - 2021-09-03

Added

• Added ErrorHandlerFunc to use a function as an "go.opentelemetry.io/otel".ErrorHandler. (#2149)
• Added "go.opentelemetry.io/otel/trace".WithStackTrace option to add a stack trace when using span.RecordError or when panic is handled in span.End. (#2163)
• Added typed slice attribute types and functionality to the go.opentelemetry.io/otel/attribute package to replace the existing array type and functions. (#2162)
  • BoolSlice, IntSlice, Int64Slice, Float64Slice, and StringSlice replace the use of the Array function in the package.
• Added the go.opentelemetry.io/otel/example/fib example package. Included is an example application that computes Fibonacci numbers. (#2203)

Changed

• Metric instruments have been renamed to match the (feature-frozen) metric API specification:
  • ValueRecorder becomes Histogram
  • ValueObserver becomes Gauge
  • SumObserver becomes CounterObserver
  • UpDownSumObserver becomes UpDownCounterObserver The API exported from this project is still considered experimental. (#2202)
• Metric SDK/API implementation type InstrumentKind moves into sdkapi sub-package. (#2091)
• The Metrics SDK export record no longer contains a Resource pointer, the SDK "go.opentelemetry.io/otel/sdk/trace/export/metric".Exporter.Export() function for push-based exporters now takes a single Resource argument, pull-based exporters use "go.opentelemetry.io/otel/sdk/metric/controller/basic".Controller.Resource(). (#2120)
• The JSON output of the go.opentelemetry.io/otel/exporters/stdout/stdouttrace is harmonized now such that the output is "plain" JSON objects after each other of the form { ... } { ... } { ... }. Earlier the JSON objects describing a span were wrapped in a slice for each Exporter.ExportSpans call, like [ { ... } ][ { ... } { ... } ]. Outputting JSON object directly after each other is consistent with JSON loggers, and a bit easier to parse and read. (#2196)
• Update the NewTracerConfig, NewSpanStartConfig, NewSpanEndConfig, and NewEventConfig function in the go.opentelemetry.io/otel/trace package to return their respective configurations as structs instead of pointers to the struct. (#2212)

Deprecated

• The go.opentelemetry.io/otel/bridge/opencensus/utils package is deprecated. All functionality from this package now exists in the go.opentelemetry.io/otel/bridge/opencensus package. The functions from that package should be used instead. (#2166)
• The "go.opentelemetry.io/otel/attribute".Array function and the related ARRAY value type is deprecated. Use the typed *Slice functions and types added to the package instead. (#2162)
• The "go.opentelemetry.io/otel/attribute".Any function is deprecated. Use the typed functions instead. (#2181)
• The go.opentelemetry.io/otel/oteltest package is deprecated. The "go.opentelemetry.io/otel/sdk/trace/tracetest".SpanRecorder can be registered with the default SDK (go.opentelemetry.io/otel/sdk/trace) as a SpanProcessor and used as a replacement for this deprecated package. (#2188)

Removed

• Removed metrics test package go.opentelemetry.io/otel/sdk/export/metric/metrictest. (#2105)

Fixed

• The fromEnv detector no longer throws an error when OTEL_RESOURCE_ATTRIBUTES environment variable is not set or empty. (#2138)
• Setting the global ErrorHandler with "go.opentelemetry.io/otel".SetErrorHandler multiple times is now supported. (#2160, #2140)
• The "go.opentelemetry.io/otel/attribute".Any function now supports int32 values. (#2169)
• Multiple calls to "go.opentelemetry.io/otel/sdk/metric/controller/basic".WithResource() are handled correctly, and when no resources are provided "go.opentelemetry.io/otel/sdk/resource".Default() is used. (#2120)
• The WithoutTimestamps option for the go.opentelemetry.io/otel/exporters/stdout/stdouttrace exporter causes the exporter to correctly ommit timestamps. (#2195)
• Fixed typos in resources.go. (#2201)