Akka.TestKit 1.4.25

Maintenance Release for Akka.NET 1.4** Akka.NET v1.4.25 includes some _significant_ performance improvements for Akka.Remote and a number of important bug fixes and improvements. Bug Fixes and Improvements** [Akka.IO.Tcp: connecting to an unreachable DnsEndpoint never times out](https://github.com/akkadotnet/akka.net/issues/5154) [Akka.Actor: need to enforce `stdout-loglevel = off` all the way through ActorSystem lifecycle](https://github.com/akkadotnet/akka.net/issues/5246) [Akka.Actor: `Ask` should push unhandled answers into deadletter](https://github.com/akkadotnet/akka.net/pull/5259) [Akka.Routing: Make Router.Route` virtual](https://github.com/akkadotnet/akka.net/pull/5238) [Akka.Actor: Improve performance on `IActorRef.Child` API](https://github.com/akkadotnet/akka.net/pull/5242) - _signficantly_ improves performance of many Akka.NET functions, but includes a public API change on `IActorRef` that is source compatible but not necessarily binary-compatible. `IActorRef GetChild(System.Collections.Generic.IEnumerable<string> name)` is now `IActorRef GetChild(System.Collections.Generic.IReadOnlyList<string> name)`. This API is almost never called directly by user code (it's almost always called via the internals of the `ActorSystem` when resolving `ActorSelection`s or remote messages) so this change should be safe. [Akka.Actor: `IsNobody` throws NRE](https://github.com/akkadotnet/akka.net/issues/5213) [Akka.Cluster.Tools: singleton fix cleanup of overdue _removed members](https://github.com/akkadotnet/akka.net/pull/5229) [Akka.DistributedData: ddata exclude `Exiting` members in Read/Write `MajorityPlus`](https://github.com/akkadotnet/akka.net/pull/5227) Performance Improvements** Using our standard `RemotePingPong` benchmark, the difference between v1.4.24 and v1.4.24 is significant: _v1.4.24_ ``` OSVersion: Microsoft Windows NT 6.2.9200.0 ProcessorCount: 16 ClockSpeed: 0 MHZ Actor Count: 32 Messages sent/received per client: 200000 (2e5) Is Server GC: True Thread count: 111 Num clients, Total [msg], Msgs/sec, Total [ms] 1, 200000, 96994, 2062.08 5, 1000000, 194818, 5133.93 10, 2000000, 198966, 10052.93 15, 3000000, 199455, 15041.56 20, 4000000, 198177, 20184.53 25, 5000000, 197613, 25302.80 30, 6000000, 197349, 30403.82 ``` _v1.4.25_ ``` OSVersion: Microsoft Windows NT 6.2.9200.0 ProcessorCount: 16 ClockSpeed: 0 MHZ Actor Count: 32 Messages sent/received per client: 200000 (2e5) Is Server GC: True Thread count: 111 Num clients, Total [msg], Msgs/sec, Total [ms] 1, 200000, 130634, 1531.54 5, 1000000, 246975, 4049.20 10, 2000000, 244499, 8180.16 15, 3000000, 244978, 12246.39 20, 4000000, 245159, 16316.37 25, 5000000, 243333, 20548.09 30, 6000000, 241644, 24830.55 ``` This represents a 24% overall throughput improvement in Akka.Remote across the board. We have additional PRs staged that should get aggregate performance improvements above 40% for Akka.Remote over v1.4.24 but they didn't make it into the Akka.NET v1.4.25 release. You can [see the full set of changes introduced in Akka.NET v1.4.25 here](https://github.com/akkadotnet/akka.net/milestone/56?closed=1) | COMMITS | LOC+ | LOC- | AUTHOR | | --- | --- | --- | --- | | 32 | 1301 | 400 | Aaron Stannard | | 4 | 358 | 184 | Andreas Dirnberger | | 3 | 414 | 149 | Gregorius Soedharmo | | 3 | 3 | 3 | dependabot[bot] | | 2 | 43 | 10 | zbynek001 | | 1 | 14 | 13 | tometchy | | 1 | 139 | 3 | carlcamilleri |