1.0.0-rc10 of non-core

Most packages have no change from previous release. Only updates to use the newest API/SDK reference.

OpenTelemetry.Extensions.Hosting

• Fixes an issue where the initialization of some aspects of the SDK can be
  delayed when using the AddOpenTelemetryTracing and
  AddOpenTelemetryMetrics methods. Namely, self-diagnostics and the default
  context propagator responsible for propagating trace context and baggage.
  (#2901)

OpenTelemetry.Instrumentation.AspNet

OpenTelemetry.Instrumentation.AspNet.TelemetryHttpModule

OpenTelemetry.Instrumentation.AspNetCore

OpenTelemetry.Instrumentation.GrpcNetClient

OpenTelemetry.Instrumentation.Http

OpenTelemetry.Instrumentation.SqlClient

OpenTelemetry.Instrumentation.StackExchangeRedis

OpenTelemetry.Shims.OpenTracing

1.2.0-RC3 of core components

OpenTelemetry

• Instantiating multiple metric instruments with the same name and also
  identical in all other respects - same type, description, and unit - result
  in a single metric stream aggregating measurements from all the identical
  instruments.

  Instantiating multiple metric instruments with the same name but differ in
  some respect - different type, description, or unit - will result in a
  separate metric stream for each distinct instrument.

  (#2916)

• The Meter property on OpenTelemetry.Metrics.Metric has been removed.
  It now has MeterName and MeterVersion properties.
  (#2916)

• Added support for implementing custom ResourceDetector.
  (#2949
  #2897)

• Perf improvement for Histogram and HistogramSumCount by implementing lock-free
  updates.
  (#2951
  #2961)

OpenTelemetry.Api

• Improved wildcard support for AddSource, AddMeter to cover ? (which
  matches exactly one character).
  (#2875)

OpenTelemetry.Exporter.Console

• Removes metric related configuration options from ConsoleExporterOptions.
  MetricReaderType, PeriodicExporterMetricReaderOptions, and Temporality
  are now configurable via the MetricReaderOptions.
  (#2929)

OpenTelemetry.Exporter.InMemory

• Adds the ability to configure MetricReaderOptions via the
  AddInMemoryExporter extension method.
  (#2931)

OpenTelemetry.Exporter.Jaeger

• Change supported values for OTEL_EXPORTER_JAEGER_PROTOCOL
  Supported values: udp/thrift.compact and http/thrift.binary defined
  in the specification.
  (#2914)
• Change handling of OTEL_EXPORTER_JAEGER_ENDPOINT to require the path to
  post. Previous versions of this library would append /api/traces to the
  value specified in this variable, but now the application author must do so.
  This change must also be made if you manually configure the
  JaegerExporterOptions class - the Endpoint must now include the path.
  For most environments, this will be /api/traces. The effective default
  is still http://localhost:14268/api/traces. This was done to match
  the clarified specification)
  (#2847)

OpenTelemetry.Exporter.OpenTelemetryProtocol

• LogExporter bug fix to handle null EventName.
  (#2871)

• Fixed the default endpoint for OTLP exporter over HTTP/Protobuf.
  The default value is http://localhost:4318.
  (#2868)

• Removes metric related configuration options from OtlpExporterOptions.
  MetricReaderType, PeriodicExporterMetricReaderOptions, and Temporality
  are now configurable via the MetricReaderOptions.
  (#2717)

• Exporter bug fix to not throw exceptions from Export method.
  (#2915)

• OTLP LogExporter modified to not drop the whole batch if a single log from the
  batch is invalid.
  (#2934)

OpenTelemetry.Exporter.OpenTelemetryProtocol.Logs

OpenTelemetry.Exporter.Prometheus

OpenTelemetry.Exporter.Zipkin

• Modified Export method to catch all exceptions.
  (#2935)

1.0.0-rc9 of Instrumentation libraries and other non-core components

Instrumentation Libraries, OT shim, Hosting packages.
Refer to individual changelog.md files for details.

1.2.0-rc2 of core components

API, SDK, and Exporters.
Refer to individual changelog.md files for details.

1.2.0-rc1 - Core components

OpenTelemetry

• Prevent accessing activity Id before sampler runs in case of legacy
  activities.
  (2659)

• Added ReadOnlyTagCollection and expose Tags on MetricPoint instead of
  Keys+Values
  (#2642)

• Refactored MetricPoint and added public methods: GetBucketCounts,
  GetExplicitBounds, GetHistogramCount, and GetHistogramSum
  (#2657)

• Remove MetricStreamConfiguration.Aggregation, as the feature to customize
  aggregation is not implemented yet.
  (#2660)

• Removed the public property HistogramMeasurements and added a public method
  GetHistogramBuckets instead. Renamed the class HistogramMeasurements to
  HistogramBuckets and added an enumerator of type HistogramBucket for
  enumerating BucketCounts and ExplicitBounds. Removed GetBucketCounts and
  GetExplicitBounds methods from MetricPoint.
  (#2664)

• Refactored temporality setting to align with the latest spec.
  (#2666)

• Removed the public properties LongValue, DoubleValue, in favor of their
  counterpart public methods GetSumLong, GetSumDouble,
  GetGaugeLastValueLong, GetGaugeLastValueDouble.
  (#2667)

• MetricType modified to reserve bits for future types.
  (#2693)

OpenTelemetry.Api

OpenTelemetry.Exporter.Console

• Added configuration options for MetricReaderType to allow for configuring
  the ConsoleMetricExporter to export either manually or periodically.
  (#2648)

OpenTelemetry.Exporter.InMemory

OpenTelemetry.Exporter.Jaeger

OpenTelemetry.Exporter.OpenTelemetryProtocol

• Added configuration options for MetricReaderType to allow for configuring
  the OtlpMetricExporter to export either manually or periodically.
  (#2674)

• The internal log message used when OTLP export client connection failure occurs,
  will now include the endpoint uri as well.
  (#2686)

• Support HttpProtobuf protocol with metrics & added HttpClientFactory
  option
  (#2696)

OpenTelemetry.Exporter.Prometheus

• Bug fix for handling Histogram with empty buckets.
  (#2651)

1.2.0-beta2 of core components

Please note that "1.2.0-beta2.1" is the version of the nugets.

OpenTelemetry

• Renamed HistogramConfiguration to ExplicitBucketHistogramConfiguration
  and changed its member BucketBounds to Boundaries.
  (#2638)

• Metrics with the same name but from different meters are allowed.
  (#2634)

• Metrics SDK will not provide inactive Metrics to delta exporter.
  (#2629)

• Histogram bounds are validated when added to a View.
  (#2573)

• Changed BatchExportActivityProcessorOptions constructor to throw
  FormatException if it fails to parse any of the supported environment
  variables.

• Added BaseExporter.ForceFlush.
  (#2525)

• Exposed public Batch(T[] items, int count) constructor on Batch<T> struct
  (#2542)

• Added wildcard support for AddMeter.
  (#2459)

• Add support for multiple Metric readers
  (#2596)

• Add ability to configure MaxMetricStreams, MaxMetricPointsPerMetricStream
  (#2635)

OpenTelemetry.Api

• Updated System.Diagnostics.DiagnosticSource to version 6.0.0.
  (#2582)

OpenTelemetry.Exporter.Console

OpenTelemetry.Exporter.InMemory

OpenTelemetry.Exporter.Jaeger

• Changed JaegerExporterOptions constructor to throw
  FormatException if it fails to parse any of the supported environment
  variables.

• Added support for sending spans directly to a Jaeger Collector over HTTP
  (#2574)

OpenTelemetry.Exporter.OpenTelemetryProtocol

• Changed OtlpExporterOptions constructor to throw
  FormatException if it fails to parse any of the supported environment
  variables.

• Changed OtlpExporterOptions.MetricExportIntervalMilliseconds to default
  60000 milliseconds.
  (#2641)

OpenTelemetry.Exporter.Prometheus

• Added scrape endpoint response caching feature &
  ScrapeResponseCacheDurationMilliseconds option
  (#2610)

OpenTelemetry.Exporter.Zipkin

• Changed ZipkinExporterOptions constructor to throw
  FormatException if it fails to parse any of the supported environment
  variables.

New Contributors

• @rkbodenner made their first contribution in #2488
• @ndrwrbgs made their first contribution in #2550
• @cartermp made their first contribution in #2603
• @chertby made their first contribution in #2630
• @svetlanabrennan made their first contribution in #2641

1.0.0-rc8 release of non-core components

Refer to individual changelog files to detailed release notes.

1.2.0-beta1 core components

Please refer to individual changelog to the detailed changelog.

1.2.0-alpha4 of core components

Improved Metrics export/shutdown/flush.
Uses DiagnosticSource RC1

1.2.0-alpha3 of Core Components

Improved Metrics support - higher performance, bug fixes for Histogram, bug fixes for OTLP, Prometheus Metric exporters.
Refer to changelog for individual components for detailed changelog.