Dear hakkers,
We are pleased to announce a new patch release of Akka 2.5. Some other notable improvements and bug fixes in 2.5.23 are:
- Performance improvement of Cluster Sharding “remembering entities” #26877
 - Variant of 
Source.actorRefthat uses acking for backpressure, thanks to @nvollmar #17610 - Streams setup operator to expose materializer attributes or actor system to Source/Flow/Sink #26192
 - Handle exception thrown from SnapshotOffer correctly, thanks to @fredfp #26699
 - Fix 
viaoperator forjavadsl.FlowWithContext#26896 - Support for CompletionStage in streams, thanks to @mszczygiel #25475
 - Fix bug in supervision in Akka Typed #26706
 - Fix startup race condition in 
Source.actorRef#26714 - Fix bug in 
ByteIteratorindexOfandindexWhere#26658 
A total of 54 issues were closed since 2.5.22. The complete list can be found on the 2.5.23 milestone on github.
Credits
For this release we had the help of 20 committers – thank you all very much!
commits  added  removed
     21    969      540 Patrik Nordwall
     18    874      598 Arnout Engelen
     17    897      759 Christopher Batey
     10   1403      533 Johan Andrén
      3    544       12 Nicolas Vollmar
      3    106      125 Helena Edelson
      1    132       46 mszczygiel
      1     17       65 Kopaniev Vladyslav
      1     76        0 Arnaud Burlet
      1      9       46 tison
      1     47        2 REASY
      1     27        4 Johannes Rudolph
      1     13        3 eugene yokota
      1      5        5 skvithalani
      1      6        1 Ignasi Marimon-Clos
      1      2        2 Jongbeom Kim
      1      4        0 James Roper
      1      1        1 Jason Longshore
      1      1        1 yiksanchan
      1      1        1 Jason Zaugg
Thanks to Lightbend for their continued sponsorship of the Akka core team’s efforts. Lightbend offers commercial support for Akka.
Happy hakking!
– The Akka Team