2.1.30

• Build: Fix deterministic builds (#1420 by @mgravell)

2.1.0

• Fix: Ensure active-message is cleared (#1374 by @hamish-omny)
• Adds: Sentinel support (#1067 by @shadim, #692 by @lexxdark)
• Adds: IAsyncEnumerable<T> scanning APIs now supported (#1087 by @mgravell)
• Adds: New API for use with misbehaving sync-contexts (more info)
• Adds: TOUCH support (#1291 by @gkorland)
• Adds: Condition API (transactions) now supports SortedSetLengthEqual (#1332 by @phosphene47)
• Adds: SocketManager is now more configurable (#1115 by @naile)
• Adds: NRediSearch updated in line with JRediSearch (#1267 by @tombatron, #1199 by @oruchreis)
• Adds: Support for CheckCertificatRevocation configuration (#1234 by @BLun78 and @V912736)
• Adds: More details about exceptions (#1190 by @marafiq)
• Adds: Updated StreamCreateConsumerGroup methods to use the MKSTREAM option (#1141 by @ttingen)
• Adds: Support for NOACK in the StreamReadGroup methods (#1154 by @ttingen)
• Adds: Event-args now mockable (#1326 by @n1l)
• Fix: No-op when adding 0 values to a set (#1283 by @omeaart)
• Adds: Support for LATENCY and MEMORY (#1204 by @mgravell)
• Adds: Support for HSTRLEN (#1241 by @eitanhs)
• Adds: GeoRadiusResult is now mockable (#1175 by @firenero)
• Fix: Various documentation fixes (#1162 by @SnakyBeaky, #1135 by @ttingen, #1203 by @caveman-dick, #1240 by @Excelan, #1245 by @francoance, #1159 by @odyth, #1311 by @DillonAd, #1339 by @vp89, #1336 by @ERGeorgiev)
• Fix: Rare race-condition around exception data (#1342 by @AdamOutcalt)
• Fix: ScriptEvaluateAsync keyspace isolation (#1377 by @gliljas)
• Fix: F# compatibility enhancements (#1386 by @NickCraver)
• Fix: Improved ScriptResult null support (#1392 by @mgravell)
• Fix: Error with DNS resolution breaking endpoint iterator (#1393 by @mgravell)
• Tests: Better docker support for tests (#1389 by @ejsmith, #1391 by @NickCraver)
• Tests: General test improvements (#1183 by @mtreske, #1385 by @NickCraver, #1384 by @NickCraver)

2.0.601

• Adds: Tracking for current and next messages to help with debugging timeout issues - helpful in cases of large pipeline blockers

2.0.593

• Performance: Unify spin-wait usage on sync/async paths to one competitor
• Fix #1101: When a ChannelMessageQueue is involved, unsubscribing via any route should still unsubscribe and mark the queue-writer as complete

2.0.588

• Stability/Performance: Resolve intermittent stall in the write-lock that could lead to unexpected timeouts even when at low/reasonable (but concurrent) load

2.0.571

• Performance: Use new arena allocation API to avoid RawResult[] overhead
• Performance: Massively simplified how ResultBox<T> is implemented, in particular to reduce TaskCompletionSource<T> allocations
• Performance: Fix sync-over-async issue with async call paths, and fix the SemaphoreSlim problems that this uncovered
• Performance: Reintroduce the unsent backlog queue, in particular to improve async performance
• Performance: Simplify how completions are reactivated, so that external callers use their originating pool, not the dedicated IO pools (prevent thread stealing)
• Fix: Update Pipelines.Sockets.Unofficial to prevent issue with incorrect buffer re-use in corner-case
• Fix: KeyDeleteAsync could, in some cases, always use DEL (instead of UNLINK)
• Fix: Last unanswered write time was incorrect
• Change: Use higher Pipe thresholds when sending

2.0.519

• Fix #1007: Adapt to late changes in the RC streams API (#983 by mgravell)
• Documentation fixes (#997 by @MerelyRBLX), #1005 by @zBrianW)
• Build: Switch to SDK 2.1.500

2.0.513

• Fix #961: fix assembly binding redirect problems; IMPORTANT: this drops to an older System.Buffers version - if you have manually added redirects for 4.0.3.0, you may need to manually update to 4.0.2.0 (or remove completely)
• Fix #962: Avoid NRE in edge-case when fetching bridge

2.0.505

• Fix #943: Ensure transaction inner tasks are completed prior to completing the outer transaction task
• Fix #946: Reinstate missing TryParse methods on RedisValue
• Fix #940: Off-by-one on pre-boxed integer cache (NRediSearch)

2.0.495

2.0 is a large - and breaking - change. The key focus of this release is stability and reliability.

• Hard Break: The package identity has changed; instead of StackExchange.Redis (not strong-named) and StackExchange.Redis.StrongName (strong-named), we are now
  only releasing StackExchange.Redis (strong-named). This is a binary breaking change that requires consumers to be re-compiled; it cannot be applied via binding-redirects
• Hard Break: The platform targets have been rationalized - supported targets are .NETStandard 2.0 (and above), .NETFramework 4.6.1 (and above), and .NETFramework 4.7.2 (and above)
  (note - the last two are mainly due to assembly binding problems)
• Hard Break: The profiling API has been overhauled and simplified; full documentation is provided here
• Soft Break: The PreserveAsyncOrder behaviour of the pub/sub API has been deprecated; a new API has been provided for scenarios that require in-order pub/sub handling -
  the Subscribe method has a new overload without a handler parameter which returns a ChannelMessageQueue, which provides async ordered access to messages)
• Internal: The network architecture has moved to use System.IO.Pipelines; this has allowed us to simplify and unify a lot of the network code, and in particular fix a lot of problems relating to how the library worked with TLS and/or .NETStandard
• Change: As a result of the System.IO.Pipelines change, the error-reporting on timeouts is now much simpler and clearer; the timeouts documentation has been updated
• Removed: The HighPriority (queue-jumping) flag is now deprecated
• Internal: Most buffers internally now make use of pooled memory; RedisValue no longer preemptively allocates buffers
• Internal: Added new custom thread-pool for handling async continuations to avoid thread-pool starvation issues
• Internal: All IL generation has been removed; the library should now work on platforms that do not allow runtime-emit
• Adds: asynchronous operations now have full support for reporting timeouts
• Adds: new APIs now exist to work with pooled memory without allocations - RedisValue.CreateFrom(MemoryStream) and operator support for Memory<byte> and ReadOnlyMemory<byte>; and IDatabase.StringGetLease[Async](...), IDatabase.HashGetLease[Async](...), Lease<byte>.AsStream())
• Adds: "streams" support (thanks to ttingen for their contribution)
• Adds: Various missing commands / overloads have been added; Execute[Async] for additional commands is now available on IServer
• Fix: A lot of general bugs and issues have been resolved
• Break: RedisValue.TryParse was accidentally omitted in the overhaul; this has been rectified and will be available in the next build

A more complete list of issues addressed can be seen in this tracking issue