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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

1.1.2 - 2026-03-19

Fixed

  • fix handling of null groupConfiguration (#1130)

Other

1.1.1 - 2026-03-11

Thank you to all the contributors who helped make this release possible. We appreciate your time, effort, and passion for the Rust Lambda community. ❤️

Lambda Managed Instances

The runtime now supports Lambda Managed Instances via the concurrency-tokio feature flag (previously experimental-concurrency). Lambda Managed Instances allow multiple concurrent requests to be processed within a single execution environment. When AWS_LAMBDA_MAX_CONCURRENCY is set, the runtime spawns multiple independent long-poll workers to handle concurrent invocations. If the env var is unset or <= 1, it falls back to sequential behavior automatically — so the same handler works on both classic Lambda and Lambda Managed Instances. (#1067)

[dependencies]
lambda_runtime = { version = "1.1", features = ["concurrency-tokio"] }
lambda_runtime::run_concurrent(service_fn(my_handler)).await?;

For a complete working example, see examples/basic-lambda-concurrent. For detailed guidance on building functions for multi-concurrency, including shared state patterns and database connection pools, see the Rust runtime for Lambda Managed Instances documentation.

We would like also to involve the community in a broader discussion about improving our approach on multiconcurrency. You can find the discussion in (#1120)

Added

  • (lambda-managed-instances) log non-2xx Lambda Runtime API responses with status and body (#1109)
  • tenant ID propagation for multi-tenant Lambda use cases. The tenant_id is available in the context.tenant_id field (Option<String>) and is automatically extracted from the lambda-runtime-aws-tenant-id header when present (#1082)
  • Add builder pattern support for event response types (#1090)

Fixed

  • (test) fix test_concurrent_structured_logging_isolation (#1121)

Changed

  • MSRV updated from 1.82.0 to 1.84.0, enabled MSRV-aware resolver (#1078)
  • X-Ray trace ID now sourced from Context instead of environment variables (#1067)

Other

  • (lambda-managed-instances) add tokio_unstable to known cfgs to avoid linter warns (#1095)
  • (lambda-managed-instances) verify request-ID isolation in concurrent exec (#1086)
  • (lambda-managed-instances) warn on run() with AWS_LAMBDA_MAX_CONCURRENCY, rename feature experimental-concurrency to concurrency-tokio (#1095)
  • Introducing Harness Testing (#1103)

1.1.0-rc1 - 2026-02-04

Added

  • (lambda-managed-instances) Lambda Managed Instances support via concurrency-tokio feature flag (#1067)
  • (lambda-managed-instances) tenant ID propagation for multi-tenant Lambda use cases (#1082)

Changed

  • MSRV updated from 1.82.0 to 1.84.0, enabled MSRV-aware resolver (#1078)
  • X-Ray trace ID now sourced from Context instead of environment variables (#1067)