bloc_signals_otel 0.2.3

OpenTelemetry tracing instrumentation for BlocSignal.

⚡ bloc_signals_otel

"With the rigor of Bloc and the flex and speed of Signal"

OpenTelemetry tracing instrumentation for BlocSignal state containers.

This package provides OtelBlocSignalObserver, a custom BlocSignalObserver that maps BLoC events, state transitions, and exception tracebacks into OpenTelemetry spans for end-to-end distributed tracing.

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🌐 Ecosystem Packages

Package	Purpose	Pub.dev Link
bloc_signals	Core pure-Dart state containers, event registry, & VM Service telemetry	📦 pub.dev
bloc_signals_flutter	Flutter UI widgets (BlocSignalProvider, BlocSignalBuilder, BlocSignalListener, BlocSignalConsumer, BlocSignalSelector)	📦 pub.dev
bloc_signals_riverpod	Bidirectional Riverpod interop adapters (toBlocSignal(ref), toProvider())	📦 pub.dev
bloc_signals_hydrate	Persistent state storage (HydratedCubitSignal, HydratedBlocSignal)	📦 pub.dev
bloc_signals_devtools	Dedicated Flutter DevTools extension inspector UI	📦 pub.dev
bloc_signals_test	Declarative unit testing helpers (blocSignalTest)	📦 pub.dev
bloc_signals_lint	Static analysis lints & IDE quick-fixes	📦 pub.dev
bloc_signals_otel	OpenTelemetry tracing observers	📦 pub.dev

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⚡ Key Features

• 📊 Span Correlation: Maps incoming BLoC events directly to active OpenTelemetry trace spans.
• 🚨 Error Tracing: Captures exceptions in onError and attaches identity hash-matched stack traces to the active span.
• 🛡️ Memory-Leak Protection: Internal active span map capped at 1,000 items with LRU eviction to prevent heap leaks.

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🚀 Getting Started

Add bloc_signals_otel to your pubspec.yaml:

dependencies:
  bloc_signals: ^0.2.6
  bloc_signals_otel: ^0.2.3
  opentelemetry: ^0.1.0

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💡 Quick Example

import 'package:bloc_signals/bloc_signals.dart';
import 'package:bloc_signals_otel/bloc_signals_otel.dart';
import 'package:opentelemetry/api.dart' as otel;

void main() {
  final tracer = otel.globalTracerProvider.getTracer('my_app');

  // Register OpenTelemetry observer globally
  BlocSignalObserver.observer = OtelBlocSignalObserver(tracer: tracer);

  final bloc = CounterBloc();
  bloc.add(Increment()); // Automatically generates OpenTelemetry spans!
}

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🤖 AI Coding Assistant Skill

This package is supported by an official pre-packaged AI Coding Skill representing OpenTelemetry span correlation, error traceback matching, and tracing observer guidelines for BlocSignal.

If you develop with AI coding assistants (such as Claude Code, Antigravity, Gemini, Cursor, or Codex), you can load the bloc-signals skill bundle to guide your assistant's code generation and analysis.

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📜 License

MIT License. See LICENSE for details.