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…d migrate to tracing BREAKING CHANGE: - tracing is now a required dependency, replacing log crate - blocking_tell/blocking_ask signatures changed to accept optional timeout - Add DeadLetterReason enum to categorize message delivery failures - Add Error::is_retryable() and Error::debugging_tips() helper methods - Add test-utils feature with dead_letter_count() for testing - Log all dead letters with structured tracing::warn! events - Add optional timeout parameter to blocking_tell/blocking_ask - timeout: None uses blocking_send directly (most efficient) - timeout: Some(duration) spawns separate thread with bounded waiting - Update all examples and tests to use tracing-subscriber The tracing feature flag now controls instrumentation only (#[instrument]), not the logging system itself.
Implement per-actor metrics collection behind a `metrics` feature flag: - Lock-free MetricsCollector using AtomicU64 for minimal overhead - MetricsSnapshot for message count, processing times, error count, uptime - RAII guard for automatic processing time measurement - ActorRef methods for accessing metrics (metrics(), message_count(), etc.) - Documentation and example (metrics_demo.rs)
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Summary
DeadLetterReasonenum for diagnosing message delivery failureslogtotracingas required dependency (breaking change)Error::is_retryable()andError::debugging_tips()helper methodsBreaking Changes
tracingis now a required dependency (previouslylogwas required,tracingwas optional)tracingfeature flag now controls instrumentation only, not the logging systemblocking_tellsignature changed:blocking_tell(msg)→blocking_tell(msg, timeout: Option<Duration>)blocking_asksignature changed:blocking_ask(msg)→blocking_ask(msg, timeout: Option<Duration>)