RELEASE_NOTES.md

1.6.0 August 15th, 2025

Placeholder for nightly build

• Core: Add ILoggingAdapter context enrichment, explicit scopes, and bracketed context output in StandardOutLogger and Xunit logger
• Akka.Streams: Add cancellation-aware Source.Queue offers so backpressured pending offers can be canceled without later emitting the canceled element.
• Akka.Streams: Fixed Source.From(IAsyncEnumerable<T>) cleanup so cancellation waits for any in-flight MoveNextAsync() before disposing the async enumerator and its cancellation token source.
• Build: Bump MessagePack to 3.1.7 to address CVE-2026-48109 (LZ4 decompression out-of-bounds read)
• Core: Fix consistent-hashing router could wedge cluster-wide after a 32-bit hash collision - Fixes #8031 (forward-port of #8294): When two virtual nodes collided in the 32-bit consistent-hash ring (increasingly likely at high routee counts, e.g. when the ring was rebuilt after a node was downed), ConsistentHash.Create threw "An entry with the same key already exists". The consistent-hashing router swallowed the exception and returned NoRoutee for every subsequent message until a manual restart. The ring now re-hashes and linear-probes to the next free slot on a collision instead of throwing. This keeps the hash distribution unchanged and produces a byte-identical ring to prior versions whenever no collision occurs (safe for rolling upgrades), and also protects Akka.Cluster.Tools' ClusterReceptionist, which builds the same ring.

1.5.47 August 12th, 2025

Akka.NET v1.5.47 is a minor patch containing several stability improvements to Akka.TestKit.

• TestKit: Replace Thread.Sleep with SpinWait
• TestKit: Fix excessive AggregateException nesting when cancelling ExpectMessageAsync
• TestKit: Add async overload to multi-node TestConductor API
• Core: Move ByteBuffer alias to global using

4 contributors since release 1.5.46

COMMITS	LOC+	LOC-	AUTHOR
7	4185	3156	Aaron Stannard
5	352	142	Gregorius Soedharmo
1	2	2	dependabot[bot]
1	13	22	Simon Cropp

To see the full set of changes in Akka.NET v1.5.47, click here

1.5.46 July 17th, 2025

Akka.NET v1.5.46 is a minor patch containing a fix for the Akka.IO.Dns extension.

• Core: Resolve ManagerClass type from IDnsProvider

3 contributors since release 1.5.45

COMMITS	LOC+	LOC-	AUTHOR
1	4	0	Aaron Stannard
1	1	1	Pavel Anpin
1	1	0	Gregorius Soedharmo

To see the full set of changes in Akka.NET v1.5.46, click here

1.5.45 July 7th, 2025

Akka.NET v1.5.45 is a minor patch containing bug fixes for Core Akka and Akka.Cluster.Sharding plugin.

• Core: Code modernization, use deconstructor for variable swapping
• Sharding: Fix unclean ShardingConsumerControllerImpl shutdown
• Core: Convert Failure to Exception for Ask<object>
• Core: Fix Settings.InjectTopLevelFallback race condition
• Sharding: Make remembered entities honor supervision strategy decisions

Supervision Strategy For Sharding Remembered Entities

• We've added a SupervisorStrategy property to ClusterShardingSettings. You can use any type of SupervisionStrategy, but it is recommended that you inherit ShardSupervisionStrategy if you're making your own custom supervision strategy.
• Remembered shard entities will now honor SupervisionStrategy decisions and stops remembered entities if the SupervisionStrategy.Decider returned a Directive.Stop or if there is a maximum restart retry limitation.

4 contributors since release 1.5.44

COMMITS	LOC+	LOC-	AUTHOR
10	823	108	Gregorius Soedharmo
1	7	13	Simon Cropp
1	60	18	ondravondra
1	1	0	Aaron Stannard

To see the full set of changes in Akka.NET v1.5.45, click here

1.5.44 June 19th, 2025

Akka.NET v1.5.44 is a minor patch that contains a bug fix to the Akka.Persistence plugin.

• Persistence: Make sure that EventSourced timer is canceled when persistent actor is stopped

3 contributors since release 1.5.43

COMMITS	LOC+	LOC-	AUTHOR
10	438	323	Gregorius Soedharmo
2	4	2015	Aaron Stannard
1	47	43	Simon Cropp

To see the full set of changes in Akka.NET v1.5.44, click here.

1.5.43 June 10th, 2025

Akka.NET v1.5.43 contains several bug fixes and also adds new quality of life features.

• Cluster.Tools: Fix PublishWithAck response message type
• Sharding: Allows sharding delivery consumer to passivate self
• TestKit: Fix CallingThreadDispatcher async context switching
• Persistence.Query: Add non-generic ReadJournalFor API method
• Core: Simplify null checks
• Core: Propagate CoordinatedShutdown reason to application exit code
• Core: Bump AkkaAnalyzerVersion to 0.3.3
• Core: Improve IScheduledTellMsg DeadLetter log message

New Akka.Analyzer Rules

We've added three new Akka.Analyzer rules, AK2003, AK2004, and AK2005. All of them addresses the same Akka anti-pattern where a void async delegate is being passed into the ReceiveActor.Receive<T>() (AK2003), IDslActor.Receive<T>() (AK2004), and ReceivePersistentActor.Command<T>() (AK2005) message handlers.

Here are the documentation for each new rules:

• AK2003 documentation
• AK2004 documentation
• AK2005 documentation

4 contributors since release 1.5.42

COMMITS	LOC+	LOC-	AUTHOR
7	435	19	Gregorius Soedharmo
2	26	23	Mark Dinh
1	49	136	Simon Cropp
1	4	0	Aaron Stannard

To see the full set of changes in Akka.NET v1.5.43, click here.