Changelog

The complete commit-level changelog lives in CHANGELOG.md on the repository. This page summarises what's worth knowing per release.

v1.3 — May 2026

• Persistent workers. Long-lived worker processes for hot toolchains (JVM, Bazel-style). 5-20× speedup on JVM-heavy builds. See Persistent workers.
• 3× faster scheduler dispatch. Lock-free path on the hot routing function; p99 dispatch latency drops below 1 ms.
• First-class GPU support. Workers can advertise CUDA / ROCm capabilities; the scheduler matches actions on them.
• fast_slow store layering is now stable.

v1.2 — March 2026

• LRE shipped to GA. Hermetic builds on localhost, no Docker.
• Multi-region CAS replication. Built-in cross-region sync for the durable store layer.
• OpenTelemetry tracing wired through every RPC. Configurable sample rate per operation.

v1.1 — January 2026

• Worker autoscaling improvements. New queue_depth Prometheus metric, drives HPA more accurately than CPU.
• S3 store retry hardening. Exponential backoff with jitter, per-request circuit breakers.
• Configurable Action Cache TTL. Per-instance overrides.

v1.0 — November 2025

• GA release. Production-stable APIs, semver from this point on.
• FSL-Apache licensing. The repository moved to FSL-1.1-Apache-2.0 for most modules, with feature-specific Business Source License modules called out in source headers. See the license page.
• Helm chart for Kubernetes deployment promoted to stable.

v0.x — pre-GA

The 0.x line was iterated heavily; see the GitHub release notes for the full history.