0.31.0

:boom: Breaking Change

• feature(views): move views registration to MeterProvider constructor #3066 @pichlermarc
• feat(sdk-metrics-base): split up Singular into Sum and Gauge in MetricData #3079 @pichlermarc
  • removes DataPointType.SINGULAR, and replaces it with DataPointType.SUM and DataPointType.GAUGE
  • removes SingularMetricData and replaces it with SumMetricData (including an additional isMonotonic flag) and GaugeMetricData
• feat(histogram): align collection of optional Histogram properties with spec #3102 @pichlermarc
  • changes type of sum property on Histogram to number | undefined
  • changes type of min and max properties on Histogram to number | undefined
  • removes hasMinMax flag on the exported Histogram - this is now indicated by min and max being undefined

:rocket: (Enhancement)

• feat(metrics-api): use common attributes definitions #3038 @legendecas
• feat(otlp-proto): pre-compile proto files #3098 @legendecas
• feat(opentelemetry-sdk-metrics-base): added InMemoryMetricExporter #3039 @weyert

:bug: (Bug Fix)

• fix(histogram): fix maximum when only values < -1 are provided #3086 @pichlermarc
• fix(sdk-metrics-base): fix PeriodicExportingMetricReader keeping Node.js process from exiting #3106 @seemk
• fix(otlp-proto): fixes #2791 otlp proto exporters no longer share a single global proto definition #3098 @legendecas