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Update RELEASE_NOTES.md for 1.5.0-alpha2 release #6198

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Oct 17, 2022
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Update RELEASE_NOTES.md for 1.5.0-alpha2 release #6198

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24 changes: 24 additions & 0 deletions RELEASE_NOTES.md
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#### 1.5.0-alpha2 October 17th 2022 ####
Akka.NET v1.5.0-alpha2 is a maintenance release for Akka.NET v1.5 that contains numerous performance improvements in critical areas, including core actor message processing and Akka.Remote.

**Performance Fixes**

* [remove delegate allocation from `ForkJoinDispatcher` and `DedicatedThreadPool`](https://github.com/akkadotnet/akka.net/pull/6162)
* [eliminate `Mailbox` delegate allocations](https://github.com/akkadotnet/akka.net/pull/6162)
* [Reduce `FSM<TState, TData>` allocations](https://github.com/akkadotnet/akka.net/pull/6162)
* [removed boxing allocations inside `FSM.State.Equals`](https://github.com/akkadotnet/akka.net/pull/6196)
* [Eliminate `DefaultLogMessageFormatter` allocations](https://github.com/akkadotnet/akka.net/pull/6166)

In sum you should expect to see total memory consumption, garbage collection, and throughput improve when you upgrade to Akka.NET v1.5.0-alpha2.

**Other Features and Improvements**

* [DData: Suppress gossip message from showing up in debug log unless verbose debug logging is turned on](https://github.com/akkadotnet/akka.net/pull/6089)
* [TestKit: TestKit automatically injects the default TestKit default configuration if an ActorSystem is passed into its constructor](https://github.com/akkadotnet/akka.net/pull/6092)
* [Sharding: Added a new `GetEntityLocation` query message to retrieve an entity address location in the shard region](https://github.com/akkadotnet/akka.net/pull/6107)
* [Sharding: Fixed `GetEntityLocation` uses wrong actor path](https://github.com/akkadotnet/akka.net/pull/6121)
* [Akka.Cluster and Akka.Cluster.Sharding: should throw human-friendly exception when accessing cluster / sharding plugins when clustering is not running](https://github.com/akkadotnet/akka.net/pull/6169)
* [Akka.Cluster.Sharding: Add `HashCodeMessageExtractor` factory](https://github.com/akkadotnet/akka.net/pull/6173)
* [Akka.Persistence.Sql.Common: Fix `DbCommand.CommandTimeout` in `BatchingSqlJournal`](https://github.com/akkadotnet/akka.net/pull/6175)


#### 1.5.0-alpha1 August 22 2022 ####
Akka.NET v1.5.0-alpha1 is a major release that contains a lot of code improvement and rewrites/refactors. **Major upgrades to Akka.Cluster.Sharding in particular**.

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