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Added

• Implement Layer for tuples of up to 16 elements (#694)

Added

• load_shed: Public constructor for Overloaded error (#661)

Fixed

• util: Fix hang with call_all when the Stream of requests is pending (#656)
• ready_cache: Ensure cancelation is observed by pending services (#668, fixes #415)
• docs: Fix a missing section header due to a typo (#646)
• docs: Fix broken links to Service trait (#659)

Added

• docs: Clarify subtlety around cloning and readiness in the Service docs (#548)
• docs: Clarify details around shared resource consumption in poll_ready() (#662)

Fixed

• hedge, load, retry: Fix use of Instant operations that can panic on platforms where Instant is not monotonic (#633)
• Disable attributes feature on tracing dependency (#623)
• Remove unused dependencies and dependency features with some feature combinations (#603, #602)
• docs: Fix a typo in the RustDoc for Buffer (#622)

Changed

• Updated minimum supported Rust version (MSRV) to 1.49.0.
• hedge: Updated hdrhistogram dependency to v7.0 (#602)
• Updated tokio-util dependency to v0.7 (#638)

Added

• util: Add BoxCloneService which is a Clone + Send boxed Service (#615)
• util: Add ServiceExt::boxed and ServiceExt::boxed_clone for applying the BoxService and BoxCloneService middleware (#616)
• builder: Add ServiceBuilder::boxed and ServiceBuilder::boxed_clone for applying BoxService and BoxCloneService layers (#616)

Fixed

• util: Remove redundant F: Clone bound from ServiceExt::map_request (#607)
• util: Remove unnecessary Debug bounds from impl Debug for BoxService (#617)
• util: Remove unnecessary Debug bounds from impl Debug for UnsyncBoxService (#617)
• balance: Remove redundant Req: Clone bound from Clone impls for MakeBalance, and MakeBalanceLayer (#607)
• balance: Remove redundant Req: Debug bound from Debug impls for MakeBalance, MakeFuture, Balance, and Pool (#607)
• ready-cache: Remove redundant Req: Debug bound from Debug impl for ReadyCache (#607)
• steer: Remove redundant Req: Debug bound from Debug impl for Steer (#607)
• docs: Fix doc(cfg(...)) attributes of PeakEwmaDiscover, and PendingRequestsDiscover (#610)

• Fix accidental breaking change when using the rustdoc::broken_intra_doc_links lint (#605)
• Clarify that tower's minimum supported rust version is 1.46 (#605)

• Migrate to pin-project-lite (#595)
• builder: Implement Layer for ServiceBuilder (#600)
• builder: Add ServiceBuilder::and_then analogous to ServiceExt::and_then (#601)

Added

• builder: Add ServiceBuilder::map_result analogous to ServiceExt::map_result (#583)
• limit: Add GlobalConcurrencyLimitLayer to allow reusing a concurrency limit across multiple services (#574)

Deprecated

• util: Deprecated ServiceExt::ready_and (renamed to ServiceExt::ready). (#567)
• util: Deprecated ReadyAnd future (renamed to Ready). (#567)

Added

• builder: Add ServiceBuilder::layer_fn to add a layer built from a function. (#560)
• builder: Add ServiceBuilder::map_future for transforming the futures produced by a service. (#559)
• builder: Add ServiceBuilder::service_fn for applying Layers to an async function using util::service_fn. (#564)
• util: Add example for service_fn. (#563)
• util: Add BoxLayer for creating boxed Layer trait objects. (#569)

Added

• util: Add ServiceExt::map_future. (#542)
• builder: Add ServiceBuilder::option_layer to optionally add a layer. (#555)
• make: Add Shared which lets you implement MakeService by cloning a service. (#533)

Fixed

• util: Make combinators that contain closures implement Debug. They previously wouldn't since closures never implement Debug. (#552)
• steer: Implement Clone for Steer. (#554)
• spawn-ready: SpawnReady now propagates the current tracing span to spawned tasks (#557)
• Only pull in tracing for the features that need it. (#551)