1.2.0-rc5 of Core Components

This is the final RC for 1.2.0 release.
OpenTelemetry

• Removed the Temporality setting on MetricReader and replaced it with
  TemporalityPreference. This is a breaking change.
  TemporalityPreference is used to determine the AggregationTemporality
  used on a per-instrument kind basis. Currently, there are two preferences:

  • Cumulative: Measurements from all instrument kinds are aggregated using
    AggregationTemporality.Cumulative.
  • Delta: Measurements from Counter, ObservableCounter, and Histogram
    instruments are aggregated using AggregationTemporality.Delta. When
    UpDownCounters are supported with
    DiagnosticSource version 7.0 onwards,
    they will be aggregated using AggregationTemporality.Cumulative.
    (#3153)

• Fix issue where ExplicitBucketHistogramConfiguration could be used to
  configure metric streams for instruments that are not histograms. Currently,
  it is not possible to change the aggregation of an instrument with views. This
  may be possible in the future.
  (#3126)

• Conformed to the specification to ensure that each view that an instrument
  matches results in a new metric stream. With this change it is possible for
  views to introduce conflicting metric streams. Any conflicts encountered will
  result in a diagnostic log.
  (#3148)

OpenTelemetry.Api

OpenTelemetry.Exporter.Console

OpenTelemetry.Exporter.InMemory

OpenTelemetry.Exporter.Jaeger

OpenTelemetry.Exporter.OpenTelemetryProtocol

• Updated underlying proto files to
  v0.16.0.
  The LogRecord.Name field was removed. The CategoryName provided
  when calling CreateLogger previously populated this field. For now,
  CategoryName is no longer exported via OTLP. It will be reintroduced
  in the future as an attribute.

OpenTelemetry.Exporter.Prometheus

OpenTelemetry.Exporter.Zipkin