middleware_flutter_opentelemetry
library
Classes
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AlwaysOffSampler
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A sampler that never samples any traces.
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AlwaysOnSampler
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A sampler that always samples every trace.
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Attributes
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A collection of attributes that are immutable and type-safe.
Create with the OTelFactory methods.
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AttributeSamplingCondition
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A sampling condition that forces sampling when a span has a specific attribute value.
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Baggage
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Immutable Baggage that stores entries with unique string keys.
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BaggageEntry
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A single entry within Baggage. Typically just a value plus optional metadata.
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BaseMetric
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Base class for all metric types that includes required timestamp
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BatchSpanProcessor
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A SpanProcessor that batches spans before export.
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CommonAttributeSpanProcessor
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A span processor that injects common attributes into every span.
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CompositeResourceDetector
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Composite detector that combines multiple resource detectors.
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CompositeSampler
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A sampler that combines multiple samplers using a specified operation.
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ConsoleExporter
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A simple span exporter that prints spans to the console.
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Context
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Represents the immutable context containing active spans, baggage, and other data.
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ContextKey<T>
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Key for Context values
Each instance is unique, even if created with the same name.
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CountingSampler
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A sampler that samples every Nth request.
Optionally can be combined with conditions to override the count-based decision.
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EnvVarResourceDetector
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Detects resource information from environment variables.
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ErrorMetric
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ErrorSamplingCondition
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A sampling condition that forces sampling when a span has an error status.
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FlutterMetricReporter
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FlutterOTel
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Main entry point for Middleware Flutter OpenTelemetry SDK.
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FlutterOTelMetrics
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Extension methods for FlutterOTel related to metrics functionality.
Note: These are not actual extensions but helper methods that should be added
directly to the FlutterOTel class.
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HostResourceDetector
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Detects host-related resource information.
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HttpInstrumentationConfig
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Configuration for HTTP instrumentation
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IdGenerator
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Generates trace and span IDs according to the W3C Trace Context specification.
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LayoutShiftMetric
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Measurement<T extends num>
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Represents a data point reported via the metrics API.
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MetricCollector
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MetricExporter
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MetricExporter is responsible for sending metrics to a backend.
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MetricReader
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MetricReader is responsible for collecting metrics from a MeterProvider
and passing them to a MetricExporter.
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MetricsService
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NamePatternSamplingCondition
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A sampling condition that forces sampling when a span's name matches a pattern.
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NavigationMetric
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OTel
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Main entry point for the OpenTelemetry SDK.
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OTelDioInterceptor
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Dio interceptor for automatic instrumentation
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OTelGoRouterRedirect
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A wrapper for a GoRouter redirect function that performs
OTel instrumentation.
Use it by wrapping your redirect:
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OTelHttpClient
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Instrumented HTTP client that wraps the standard http.Client
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OTelInteractionTracker
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Tracks user interactions with UI elements and creates spans automatically.
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OTelLifecycleObserver
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Observer for app lifecycle events. This is added to the application
on FlutterOTel.initialize(). See the README for an explanation.
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OTelLog
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A simple log service that logs messages and signals to the console.
It filters messages based on the current log level.
Signals are not filtered based on log level
Defaults to noop,
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OTelMetricsBridge
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Bridge class to connect FlutterMetricReporter metrics to OpenTelemetry metrics
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OTelNavigatorObserver
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Observer for route changes in Flutter navigation
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OtlpGrpcExporterConfig
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Configuration for the OtlpGrpcSpanExporter.
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OtlpGrpcMetricExporter
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OtlpGrpcMetricExporter exports metrics to the OpenTelemetry collector via gRPC.
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OtlpGrpcMetricExporterConfig
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Configuration for the OtlpGrpcMetricExporter.
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OtlpGrpcSpanExporter
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An OpenTelemetry span exporter that exports spans using OTLP over gRPC.
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OtlpHttpExporterConfig
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Configuration for the OpenTelemetry span exporter that exports spans using OTLP over HTTP/protobuf
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OtlpHttpMetricExporter
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An OpenTelemetry metric exporter that exports metrics using OTLP over HTTP/protobuf
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OtlpHttpMetricExporterConfig
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Configuration for the OpenTelemetry metric exporter that exports metrics using OTLP over HTTP/protobuf
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OtlpHttpSpanExporter
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An OpenTelemetry span exporter that exports spans using OTLP over HTTP/protobuf
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PageLoadMetric
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PaintMetric
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ParentBasedSampler
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A sampler that respects the parent span's sampling decision.
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PerformanceMetric
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PeriodicExportingMetricReader
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PeriodicExportingMetricReader is a MetricReader that periodically
collects metrics and exports them.
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PlatformDetection
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Helper class to detect platform-specific capabilities and configurations
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PlatformResourceDetector
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Factory for creating platform-appropriate resource detectors.
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ProbabilitySampler
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A sampler that randomly samples traces based on a probability.
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ProcessResourceDetector
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Detects process-related resource information.
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RateLimitingSampler
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A sampler that limits the number of sampled traces per time window.
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Resource
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Represents a resource, which captures identifying information about the entities
for which signals (stats, traces, and logs) are reported.
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ResourceDetector
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Interface for resource detectors that automatically discover resource information.
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Sampler
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Interface for sampling decision logic.
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SamplingCondition
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Base class for sampling conditions that can be used with the CountingSampler
to override its default behavior based on span properties.
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SamplingResult
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Result of a sampling decision.
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Span
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SDK implementation of the APISpan interface.
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SpanContext
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Immutable representation of a SpanContext.
A SpanContext contains the state that must propagate to child Spans
and across process boundaries.
SpanContext follows the W3C Trace Context specification.
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SpanEvent
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Represents an event that occurred during a span's lifetime.
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SpanExporter
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A SpanExporter exports finished Spans.
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SpanId
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A span identifier - an 8-byte array with an ID in a base-16 hex format.
Follows W3C Trace Context specification.
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SpanLink
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Represents a link between spans in potentially different traces.
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SpanProcessor
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Interface for span processors that handle span lifecycle events.
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Timestamp
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Utility class for working with OpenTelemetry timestamps.
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TraceFlags
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Trace flags for a SpanContext.
These flags are used to control tracing behavior.
TraceFlags follows the W3C Trace Context specification.
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TraceId
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A trace identifier - a 16-byte array with an ID in a base-16 hex format.
TraceId follows the W3C Trace Context specification.
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TraceIdRatioSampler
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A sampler that samples traces based on a probability defined by the ratio of
traces that should be sampled. The ratio must be in the range
0.0, 1.0.
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Tracer
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SDK implementation of the APITracer interface.
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TracerProvider
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SDK implementation of the APITracerProvider interface.
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TraceState
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Key-value pairs carried along with a span context.
TraceState follows the W3C Trace Context specification.
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UIMeter
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UIMeter extends the standard Meter to provide UI-specific functionality
for Flutter applications.
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UIMeterCreate
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Factory for creating UITracer instances
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UIMeterProvider
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UIMeterProvider extends the standard SDK MeterProvider to provide UI-specific
functionality for Flutter applications.
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UIMeterProviderCreate
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Factory methods for creating UIMeterProvider instances.
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UITracer
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The main responsibility of the UITrace is to maintain span for and semantics
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UITracerCreate
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Factory for creating UITracer instances
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UITracerProvider
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UITracerProviderCreate
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Factory for creating UITracer instances
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UserInteractionMetric
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