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Changelog

All notable changes to Pulse are documented here.

This project adheres to Semantic Versioning and follows the Keep a Changelog format.

2.0.0 — 2026-04-20

Breaking changes

  • PulseProperties split into per-feature @ConfigurationProperties records — import types like SamplingProperties directly; YAML under pulse.* is unchanged.
  • pulse.sampling.probability removed — use management.tracing.sampling.probability; keep pulse.sampling.prefer-sampling-on-error.
  • DependencyClassifier / ErrorFingerprintStrategy — chain-of-responsibility: @Nullable continues the chain, @Order for precedence; first non-null wins.
  • Tracing — Micrometer Tracer instead of Span.current(); SpanEvents.emit uses Observation; OpenTelemetry SDK reflection removed.
  • Auto-configuration — one @AutoConfiguration per feature (lives under .internal); only types outside .internal are the stable public API.
  • Servlet filters — order is RequestContext → TimeoutBudget → Tenant/Priority/Retry → TraceGuard (revalidate custom filters).

Added

  • Enforcement mode (DRY_RUN / ENFORCING), POST /actuator/pulse/enforcement.
  • Presets — application-pulse-{dev,prod,test,canary}.yml; enabled-when request matchers; @PulseDryRun; JSR-380 on each *Properties record.
  • SPIs — HostNameProvider; public ResourceAttributeResolver; Apache HttpClient 5 propagation. Docs: SPI guide, API stability.
  • CI — GraalVM native smoke build of the showcase on PRs.

Fixed

  • @AutoConfigureAfter targets Spring Boot 4.0.5 OTel/Micrometer auto-config classes.
  • Composite classifier/fingerprint beans skipped when a same-named bean replaces them.
  • IDE metadata and prose docs aligned with the split properties and behaviour.

1.0.0 — 2026-04-19

Initial public release — Spring Boot 4 starter for OpenTelemetry + Micrometer: cardinality and timeout-budget guardrails, structured JSON logs, caller-side dependency RED, tenant/priority propagation, jobs, DB N+1 signals, Resilience4j, Kafka lag, profiling links, OpenFeature, Caffeine, health and /actuator/pulse, @PulseTest. Third-party stacks are optional; no agent.

Details: Documentation home. Falsifiable hot-path numbers: make bench (JMH).