Compliance Matrix

The compliance matrix below is based on the OpenTelemetry Specification template.

Traces

Item	Status	Optional	Evidence
TracerProvider / Create TracerProvider	`+`		TracerProvider.scala
TracerProvider / Get a Tracer	`+`		TracerProvider.scala
TracerProvider / Get a Tracer with schema_url	`+`		TracerBuilder.scala
TracerProvider / Get a Tracer with scope attributes	`-`
TracerProvider / Associate Tracer with InstrumentationScope	`+`		TracerProvider.scala
TracerProvider / Safe for concurrent calls	`+`		SdkTracerProvider.scala, SpanStorage.scala
TracerProvider / Shutdown (SDK only required)	`-`
TracerProvider / ForceFlush (SDK only required)	`-`
Trace / Context interaction / Get active Span	`+`		Tracer.scala
Trace / Context interaction / Set active Span	`+`		Tracer.scala
Tracer / Create a new Span	`+`		Tracer.scala
Tracer / Documentation defines adding attributes at span creation as preferred	`-`
Tracer / Get active Span	`+`		Tracer.scala
Tracer / Mark Span active	`+`		Tracer.scala
Tracer / Safe for concurrent calls	`+`		SdkTracer.scala, SpanStorage.scala
SpanContext / IsValid	`+`		SpanContext.scala
SpanContext / IsRemote	`+`		SpanContext.scala
SpanContext / Conforms to the W3C TraceContext spec	`+`		W3CTraceContextPropagator.scala
SpanContext / Support W3C Trace Context Level 2 randomness	`+`		IdGenerator.scala, SdkSpanBuilder.scala, SdkSpanBuilderSuite.scala
Span / Create root span	`+`		SdkSpanBuilder.scala
Span / Create with default parent (active span)	`+`		SdkSpanBuilder.scala
Span / Create with parent from Context	`+`		SdkSpanBuilder.scala
Span / No explicit parent Span/SpanContext allowed	`-`
Span / SpanProcessor.OnStart receives parent Context	`+`		SdkSpanBackend.scala
Span / UpdateName	`+`		SdkSpanBackend.scala
Span / User-defined start timestamp	`+`		SdkSpanBackend.scala
Span / End	`+`		SdkSpanBackend.scala
Span / End with timestamp	`+`		SdkSpanBackend.scala
Span / IsRecording	`+`		SdkSpanBackend.scala, SdkSpanBackendSuite.scala
Span / IsRecording becomes false after End	`+`		SdkSpanBackend.scala, SdkSpanBackendSuite.scala
Span / Set status with StatusCode (Unset, Ok, Error)	`+`		SdkSpanBackend.scala
Span / Safe for concurrent calls	`+`		SdkSpanBackend.scala
Span / events collection size limit	`+`		SdkSpanBackend.scala
Span / attribute collection size limit	`+`		SdkSpanBackend.scala
Span / links collection size limit	`+`		SdkSpanBackend.scala
Span / SpanProcessor.OnEnding	`-`	`true`
Span attributes / SetAttribute	`+`		SdkSpanBackend.scala
Span attributes / Set order preserved	`-`	`true`
Span attributes / String type	`+`		SdkSpanBackend.scala
Span attributes / Boolean type	`+`		SdkSpanBackend.scala
Span attributes / Double floating-point type	`+`		SdkSpanBackend.scala
Span attributes / Signed int64 type	`+`		SdkSpanBackend.scala
Span attributes / Array of primitives (homogeneous)	`+`		SdkSpanBackend.scala
Span attributes / `null` values documented as invalid/undefined	`-`
Span attributes / Unicode support for keys and string values	`+`		SdkSpanBackend.scala
Span linking / Links can be recorded on span creation	`+`		SdkSpanBuilder.scala, SdkSpanBackend.scala
Span linking / Links can be recorded after span creation	`+`		SdkSpanBuilder.scala, SdkSpanBackend.scala
Span linking / Links order is preserved	`+`		SdkSpanBuilder.scala, SdkSpanBackend.scala
Span events / AddEvent	`+`		SdkSpanBackend.scala
Span events / Add order preserved	`+`		SdkSpanBackend.scala
Span events / Safe for concurrent calls	`+`		SdkSpanBackend.scala
Span exceptions / RecordException	`+`		SdkSpanBackend.scala
Span exceptions / RecordException with extra parameters	`+`		SdkSpanBackend.scala
Sampling / Allow samplers to modify tracestate	`+`		SamplingResult.scala
Sampling / ShouldSample gets full parent Context	`+`		SdkSpanBuilder.scala, Sampler.scala
Sampling / Sampler: JaegerRemoteSampler	`-`
Sampling / New Span ID created also for non-recording Spans	`+`		SdkSpanBuilder.scala
Sampling / IdGenerators	`+`		SdkSpanBuilder.scala
Sampling / SpanLimits	`+`	`true`	SpanLimits.scala
Sampling / Built-in `SpanProcessor`s implement `ForceFlush` spec	`-`
Sampling / Attribute Limits	`+`	`true`	SpanLimits.scala, SdkSpanBackend.scala
Sampling / Fetch InstrumentationScope from ReadableSpan	`+`		SdkSpanBackend.scala
Sampling / TraceIdRatioBased sampler implements OpenTelemetry tracestate `th` field	`-`	`true`
Sampling / CompositeSampler and built-in ComposableSamplers	`-`	`true`
Sampling / Sampler: AlwaysRecord	`-`

Baggage

Item	Status	Optional	Evidence
Basic support	`+`		Baggage.scala
Use official header name `baggage`	`+`		W3CBaggagePropagator.scala

Metrics

Item	Status	Optional	Evidence
The API provides a way to set and get a global default `MeterProvider`.	`-`	`true`
It is possible to create any number of `MeterProvider`s.	`+`	`true`	SdkMeterProvider.scala
`MeterProvider` provides a way to get a `Meter`.	`+`		MeterProvider.scala
`get_meter` accepts name, `version` and `schema_url`.	`+`		MeterProvider.scala, MeterBuilder.scala
`get_meter` accepts `attributes`.	`-`
When an invalid `name` is specified a working `Meter` implementation is returned as a fallback.	`+`		SdkMeterProvider.scala
The fallback `Meter` `name` property keeps its original invalid value.	`-`	`true`
Associate `Meter` with `InstrumentationScope`.	`+`		SdkMeterProvider.scala
`Counter` instrument is supported.	`+`		Meter.scala
`AsynchronousCounter` instrument is supported.	`+`		Meter.scala
`Histogram` instrument is supported.	`+`		Meter.scala
`AsynchronousGauge` instrument is supported.	`+`		Meter.scala
`Gauge` instrument is supported.	`+`		Meter.scala
`UpDownCounter` instrument is supported.	`+`		Meter.scala
`AsynchronousUpDownCounter` instrument is supported.	`+`		Meter.scala
Instruments have `name`	`+`		Meter.scala
Instruments have kind.	`+`		Meter.scala
Instruments have an optional unit of measure.	`+`		Meter.scala
Instruments have an optional description.	`+`		Meter.scala
A valid instrument MUST be created and warning SHOULD be emitted when multiple instruments are registered under the same `Meter` using the same `name`.	`+`		ViewRegistry.scala
Duplicate instrument registration name conflicts are resolved by using the first-seen for the stream name.	`-`
It is possible to register two instruments with same `name` under different `Meter`s.	`+`		SdkMeterProvider.scala
Instrument names conform to the specified syntax.	`-`
Instrument units conform to the specified syntax.	`-`
Instrument descriptions conform to the specified syntax.	`-`
Instrument supports the advisory ExplicitBucketBoundaries parameter.	`+`		Histogram.scala, SdkHistogram.scala
Instrument supports the advisory Attributes parameter.	`-`
All methods of `MeterProvider` are safe to be called concurrently.	`+`		SdkMeterProvider.scala, ComponentRegistry.scala
All methods of `Meter` are safe to be called concurrently.	`+`		SdkMeter.scala, MeterSharedState.scala
All methods of any instrument are safe to be called concurrently.	`+`		SdkCounter.scala, SynchronousStorage.scala, SynchronousStorage.scala
`MeterProvider` allows a `Resource` to be specified.	`+`		SdkMeterProvider.scala
A specified `Resource` can be associated with all the produced metrics from any `Meter` from the `MeterProvider`.	`+`		SdkMeterProvider.scala
The supplied `name`, `version` and `schema_url` arguments passed to the `MeterProvider` are used to create an `InstrumentationLibrary` instance stored in the `Meter`.	`+`		SdkMeterProvider.scala
The supplied `name`, `version` and `schema_url` arguments passed to the `MeterProvider` are used to create an `InstrumentationScope` instance stored in the `Meter`.	`+`		SdkMeterProvider.scala
Configuration is managed solely by the `MeterProvider`.	`+`		SdkMeterProvider.scala
The `MeterProvider` provides methods to update the configuration	`-`	`true`
The updated configuration applies to all already returned `Meter`s.	`-`	`if above`
There is a way to register `View`s with a `MeterProvider`.	`+`		SdkMeterProvider.scala
The `View` instrument selection criteria is as specified.	`+`		InstrumentSelector.scala
The `View` instrument selection criteria supports wildcards.	`+`	`true`	InstrumentSelector.scala
The `View` instrument selection criteria supports the match-all wildcard.	`+`		InstrumentSelector.scala
The name of the `View` can be specified.	`+`		View.scala
The `View` allows configuring the name, description, attributes keys and aggregation of the resulting metric stream.	`+`		View.scala
The `View` allows configuring excluded attribute keys of resulting metric stream.	`+`		View.scala
The `View` allows configuring the exemplar reservoir of resulting metric stream.	`-`	`true`
The SDK allows more than one `View` to be specified per instrument.	`+`	`true`	ViewRegistry.scala
The `Drop` aggregation is available.	`+`		Aggregation.scala
The `Default` aggregation is available.	`+`		Aggregation.scala
The `Default` aggregation uses the specified aggregation by instrument.	`+`		Aggregation.scala
The `Sum` aggregation is available.	`+`		Aggregation.scala
The `LastValue` aggregation is available.	`+`		Aggregation.scala
The `ExplicitBucketHistogram` aggregation is available.	`+`		Aggregation.scala, ExplicitBucketHistogramOptions.scala
The `ExponentialBucketHistogram` aggregation is available.	`+`		Aggregation.scala, Base2ExponentialHistogramOptions.scala, ExponentialHistogramAggregator.scala
The metrics Reader implementation supports registering metric Exporters	`+`		MetricReader.scala, PeriodicMetricReader.scala
The metrics Reader implementation supports configuring the default aggregation on the basis of instrument kind.	`+`		PeriodicMetricReader.scala
The metrics Reader implementation supports configuring the default temporality on the basis of instrument kind.	`+`		PeriodicMetricReader.scala
The metrics Exporter has access to the aggregated metrics data (aggregated points, not raw measurements).	`+`		MetricExporter.scala
The metrics Exporter `export` function can not be called concurrently from the same Exporter instance.	`+`		PeriodicMetricReader.scala
The metrics Exporter `export` function does not block indefinitely.	`+`		PeriodicMetricReader.scala
The metrics Exporter `export` function receives a batch of metrics.	`+`		MetricExporter.scala
The metrics Exporter `export` function returns `Success` or `Failure`.	`+`		PeriodicMetricReader.scala
The metrics Exporter provides a `ForceFlush` function.	`+`		MetricExporter.scala
The metrics Exporter `ForceFlush` can inform the caller whether it succeeded, failed or timed out.	`-`
The metrics Exporter provides a `shutdown` function.	`-`
The metrics Exporter `shutdown` function do not block indefinitely.	`-`
The metrics SDK samples `Exemplar`s from measurements.	`+`		ExemplarReservoir.scala
Exemplar sampling can be disabled.	`+`		ExemplarReservoir.scala
The metrics SDK supports SDK-wide exemplar filter configuration	`+`		ExemplarFilterAutoConfigure.scala
The metrics SDK supports `TraceBased` exemplar filter	`+`		ExemplarFilter.scala
The metrics SDK supports `AlwaysOn` exemplar filter	`+`		ExemplarFilter.scala
The metrics SDK supports `AlwaysOff` exemplar filter	`+`		ExemplarFilter.scala
Exemplars retain any attributes available in the measurement that are not preserved by aggregation or view configuration.	`+`		ExemplarData.scala
Exemplars contain the associated trace id and span id of the active span in the Context when the measurement was taken.	`+`		ExemplarData.scala
Exemplars contain the timestamp when the measurement was taken.	`+`		ExemplarData.scala
The metrics SDK provides an `ExemplarReservoir` interface or extension point.	`+`		ExemplarReservoir.scala
An `ExemplarReservoir` has an `offer` method with access to the measurement value, attributes, `Context` and timestamp.	`+`		ExemplarReservoir.scala
The metrics SDK provides a `SimpleFixedSizeExemplarReservoir` that is used by default for all aggregations except `ExplicitBucketHistogram`.	`+`		ExemplarReservoir.scala
The metrics SDK provides an `AlignedHistogramBucketExemplarReservoir` that is used by default for `ExplicitBucketHistogram` aggregation.	`+`		ExemplarReservoir.scala
A metric Producer accepts an optional metric Filter	`-`
The metric Reader implementation supports registering metric Filter and passing them its registered metric Producers	`-`
The metric SDK's metric Producer implementations uses the metric Filter	`-`
Metric SDK implements cardinality limit	`+`		SynchronousStorage.scala
Metric SDK supports configuring cardinality limit at MeterReader level	`+`		CardinalityLimitSelector.scala
Metric SDK supports configuring cardinality limit per metric (using Views)	`+`		View.scala

Logs

Item	Status	Optional	Evidence
LoggerProvider.Get Logger	`+`		LoggerProvider.scala
LoggerProvider.Get Logger accepts attributes	`-`
LoggerProvider.Shutdown	`-`
LoggerProvider.ForceFlush	`-`
Logger.Emit(LogRecord)	`+`		SdkLogRecordBuilder.scala
LogRecord.Set EventName	`+`		SdkLogRecordBuilder.scala
Logger.Enabled	`+`	`true`	SdkLogger.scala, SdkLoggerProvider.scala
Ergonomic API	`-`	`true`
SimpleLogRecordProcessor	`+`		SimpleLogRecordProcessor.scala
BatchLogRecordProcessor	`+`		BatchLogRecordProcessor.scala, BatchLogRecordProcessorSuite.scala
Can plug custom LogRecordProcessor	`+`		SdkLoggerProvider.scala
LogRecordProcessor.Enabled	`-`	`true`
OTLP/gRPC exporter	`+`		OtlpLogRecordExporter.scala
OTLP/HTTP exporter	`+`		OtlpLogRecordExporter.scala
OTLP File exporter	`-`
Can plug custom LogRecordExporter	`+`		LogRecordExportersAutoConfigure.scala
Trace Context Injection	`+`		SdkLogRecordBuilder.scala

Resource

Item	Status	Evidence
Create from Attributes	`+`	TelemetryResource.scala
Create empty	`+`	TelemetryResource.scala
Merge (v2)	`+`	TelemetryResource.scala
Retrieve attributes	`+`	TelemetryResource.scala
Default value for service.name	`+`	TelemetryResource.scala
Resource detector interface/mechanism	`+`	TelemetryResourceAutoConfigure.scala
Resource detectors populate Schema URL	`+`	TelemetryResourceDetectorSuite.scala, HostDetectorPlatform.scala

Context Propagation

Item	Status	Optional	Evidence
Create Context Key	`+`		Context.scala
Get value from Context	`+`		Context.scala
Set value for Context	`+`		Context.scala
Attach Context	`+`		TraceScope.scala
Detach Context	`+`		TraceScope.scala
Get current Context	`+`		TraceScope.scala
Composite Propagator	`+`		TextMapPropagator.scala
Global Propagator	`-`
TraceContext Propagator	`+`		W3CTraceContextPropagator.scala
B3 Propagator	`+`		B3Propagator.scala
Jaeger Propagator	`+`		JaegerPropagator.scala
OT Propagator	`+`		OtTracePropagator.scala
OpenCensus Binary Propagator	`-`
TextMapPropagator	`+`		TextMapPropagator.scala
Fields	`+`		TextMapPropagator.scala
Setter argument	`+`	`true`	TextMapPropagator.scala
Getter argument	`+`	`true`	TextMapPropagator.scala
Getter argument returning Keys	`+`	`true`	JaegerPropagator.scala

Environment Variables

Item	Status	Evidence
OTEL_SDK_DISABLED	`+`	CommonConfigKeys.scala, OpenTelemetrySdk.scala
OTEL_RESOURCE_ATTRIBUTES	`+`	TelemetryResourceAutoConfigure.scala
OTEL_SERVICE_NAME	`+`	TelemetryResourceAutoConfigure.scala
OTEL_LOG_LEVEL	`-`
OTEL_PROPAGATORS	`+`	ContextPropagatorsAutoConfigure.scala
OTEL_BSP_*	`+`	BatchSpanProcessorAutoConfigure.scala
OTEL_BLRP_*	`+`	BatchLogRecordProcessorAutoConfigure.scala
OTEL_EXPORTER_OTLP_*	`+`	OtlpClientAutoConfigure.scala
OTEL_EXPORTER_ZIPKIN_*	`-`
OTEL_TRACES_EXPORTER	`+`	SpanExportersAutoConfigure.scala
OTEL_METRICS_EXPORTER	`+`	MetricExportersAutoConfigure.scala
OTEL_LOGS_EXPORTER	`+`	LogRecordExportersAutoConfigure.scala
OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT	`+`	SpanLimitsAutoConfigure.scala
OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT	`+`	SpanLimitsAutoConfigure.scala
OTEL_SPAN_EVENT_COUNT_LIMIT	`+`	SpanLimitsAutoConfigure.scala
OTEL_SPAN_LINK_COUNT_LIMIT	`+`	SpanLimitsAutoConfigure.scala
OTEL_EVENT_ATTRIBUTE_COUNT_LIMIT	`+`	SpanLimitsAutoConfigure.scala
OTEL_LINK_ATTRIBUTE_COUNT_LIMIT	`+`	SpanLimitsAutoConfigure.scala
OTEL_LOGRECORD_ATTRIBUTE_COUNT_LIMIT	`+`	LogRecordLimitsAutoConfigure.scala, LogRecordLimitsAutoConfigureSuite.scala
OTEL_LOGRECORD_ATTRIBUTE_VALUE_LENGTH_LIMIT	`+`	LogRecordLimitsAutoConfigure.scala, LogRecordLimitsAutoConfigureSuite.scala
OTEL_TRACES_SAMPLER	`+`	SamplerAutoConfigure.scala
OTEL_TRACES_SAMPLER_ARG	`+`	SamplerAutoConfigure.scala
OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT	`+`	AttributeLimitsConfigurer.scala, LogRecordLimitsAutoConfigureSuite.scala, SpanLimitsAutoConfigureSuite.scala
OTEL_ATTRIBUTE_COUNT_LIMIT	`+`	AttributeLimitsConfigurer.scala, LogRecordLimitsAutoConfigureSuite.scala, SpanLimitsAutoConfigureSuite.scala
OTEL_METRIC_EXPORT_INTERVAL	`+`	MetricReadersAutoConfigure.scala
OTEL_METRIC_EXPORT_TIMEOUT	`+`	MetricReadersAutoConfigure.scala
OTEL_METRICS_EXEMPLAR_FILTER	`+`	ExemplarFilterAutoConfigure.scala
OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE	`+`	OtlpMetricExporterAutoConfigure.scala, OtlpMetricExporterAutoConfigureSuite.scala
OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION	`+`	OtlpMetricExporterAutoConfigure.scala, OtlpMetricExporterAutoConfigureSuite.scala
OTEL_EXPERIMENTAL_CONFIG_FILE	`-`

Declarative configuration

Item	Status	Optional	Evidence
`Parse` a configuration file	`-`
The `Parse` operation accepts the configuration YAML file format	`-`
The `Parse` operation performs environment variable substitution	`-`
The `Parse` operation returns configuration model	`-`
The `Parse` operation resolves extension component configuration to `properties`	`-`
`Create` SDK components	`-`
The `Create` operation accepts configuration model	`-`
The `Create` operation returns `TracerProvider`	`-`
The `Create` operation returns `MeterProvider`	`-`
The `Create` operation returns `LoggerProvider`	`-`
The `Create` operation returns `Propagators`	`-`
The `Create` operation calls `CreatePlugin` of corresponding `ComponentProvider` when encountering extension components	`-`
Register a `ComponentProvider`	`-`

Exporters

Item	Status	Optional	Evidence
Exporter interface	`+`		SpanExporter.scala
Exporter interface has `ForceFlush`	`+`		SpanExporter.scala
Standard output (logging)	`+`		ConsoleSpanExporter.scala, ConsoleMetricExporter.scala, ConsoleLogRecordExporter.scala
In-memory (mock exporter)	`+`		InMemorySpanExporter.scala, InMemoryMetricExporter.scala, InMemoryLogRecordExporter.scala
OTLP / OTLP/gRPC Exporter	`+`		OtlpSpanExporter.scala
OTLP / OTLP/HTTP binary Protobuf Exporter	`+`		OtlpSpanExporter.scala
OTLP / OTLP/HTTP JSON Protobuf Exporter	`+`		OtlpSpanExporter.scala
OTLP / OTLP/HTTP gzip Content-Encoding support	`+`	`true`	OtlpClient.scala
OTLP / Concurrent sending	`+`		SpanExporter.scala
OTLP / Honors retryable responses with backoff	`+`	`true`	OtlpClient.scala, OtlpClient.scala
OTLP / Honors non-retryable responses	`-`	`true`
OTLP / Honors throttling response	`-`	`true`
OTLP / Multi-destination spec compliance	`-`	`true`
OTLP / SchemaURL in ResourceSpans and ScopeSpans	`+`		SpansProtoEncoder.scala
OTLP / SchemaURL in ResourceMetrics and ScopeMetrics	`+`		MetricsProtoEncoder.scala
OTLP / SchemaURL in ResourceLogs and ScopeLogs	`+`		LogsProtoEncoder.scala
OTLP / Honors the user agent spec	`+`		OtlpClient.scala
OTLP / Partial Success messages are handled and logged for OTLP/gRPC	`+`	`true`	OtlpClient.scala, SpansProtoEncoder.scala, MetricsProtoEncoder.scala, LogsProtoEncoder.scala
OTLP / Partial Success messages are handled and logged for OTLP/HTTP	`-`	`true`
OTLP / Metric Exporter configurable temporality preference	`+`		OtlpMetricExporter.scala
OTLP / Metric Exporter configurable default aggregation	`+`		OtlpMetricExporter.scala
Zipkin / Zipkin V1 JSON	`-`	`true`
Zipkin / Zipkin V1 Thrift	`-`	`true`
Zipkin / Zipkin V2 JSON	`-`	`true`
Zipkin / Zipkin V2 Protobuf	`-`	`true`
Zipkin / Service name mapping	`-`
Zipkin / SpanKind mapping	`-`
Zipkin / InstrumentationLibrary mapping	`-`
Zipkin / InstrumentationScope mapping	`-`
Zipkin / Boolean attributes	`-`
Zipkin / Array attributes	`-`
Zipkin / Status mapping	`-`
Zipkin / Error Status mapping	`-`
Zipkin / Event attributes mapping to Annotations	`-`
Zipkin / Integer microseconds in timestamps	`-`
Prometheus / Metadata Deduplication	`+`		PrometheusWriter.scala
Prometheus / Name Sanitization	`+`		PrometheusConverter.scala
Prometheus / UNIT Metadata	`+`	`true`	PrometheusConverter.scala
Prometheus / Unit Suffixes	`+`	`true`	PrometheusWriter.scala
Prometheus / Unit Full Words	`+`	`true`	PrometheusConverter.scala
Prometheus / HELP Metadata	`+`		PrometheusWriter.scala
Prometheus / TYPE Metadata	`+`		PrometheusWriter.scala
Prometheus / otelscopename and otelscopeversion labels on all Metrics	`+`		PrometheusWriter.scala
Prometheus / otelscope'attribute' labels on all Metrics	`+`		PrometheusWriter.scala
Prometheus / otel_scope labels can be disabled	`+`	`true`	PrometheusWriter.scala
Prometheus / Gauges become Prometheus Gauges	`+`		PrometheusWriter.scala
Prometheus / Cumulative Monotonic Sums become Prometheus Counters	`+`		PrometheusWriter.scala
Prometheus / Prometheus Counters have _total suffix by default	`+`		PrometheusWriter.scala
Prometheus / Prometheus Counters _total suffixing can be disabled	`+`	`true`	PrometheusWriter.scala
Prometheus / Cumulative Non-Monotonic Sums become Prometheus Gauges	`+`		PrometheusWriter.scala
Prometheus / Delta Non-Monotonic Sums become Cumulative Prometheus Counters	`-`	`true`
Prometheus / Cumulative Histograms become Prometheus Histograms	`+`		PrometheusWriter.scala
Prometheus / Delta Histograms become Cumulative Prometheus Histograms	`-`	`true`
Prometheus / Attributes Keys are Sanitized	`+`		PrometheusConverter.scala
Prometheus / Colliding sanitized attribute keys are merged	`+`		PrometheusWriter.scala
Prometheus / Exemplars for Histograms and Monotonic sums	`-`	`true`
Prometheus / `target_info` metric from Resource	`+`	`true`	PrometheusWriter.scala

OpenCensus Compatibility

Item	Status	Optional	Evidence
Trace Bridge	`-`
Metric Bridge	`-`

OpenTracing Compatibility

Item	Status	Optional	Evidence
Create OpenTracing Shim	`-`
Tracer	`-`
Span	`-`
SpanContext	`-`
ScopeManager	`-`
Error mapping for attributes/events	`-`
Migration to OpenTelemetry guide	`-`