- Removed kafka flags in favor of kafka.producer/kafka.consumer and introduced admin port grouping, requiring Prometheus rule updates (breaking).
- Added new features: gRPC resolver and query support, storage plugin framework, custom Kafka client ID, TLS insecure flag, health/info and pprof endpoints, agent‑level tags, downsampling writer, and inbound transport label.
- Fixed bugs and made minor improvements such as trace sorting, span format tag, CORS handling for Zipkin collector, Go 1.12.1 upgrade, and pinned UI to version 1.2.0.