diff --git a/akka-actor-tests/src/test/scala/akka/actor/DeadLetterSuspensionSpec.scala b/akka-actor-tests/src/test/scala/akka/actor/DeadLetterSuspensionSpec.scala
index 1c4d5838a6..91b367ac14 100644
--- a/akka-actor-tests/src/test/scala/akka/actor/DeadLetterSuspensionSpec.scala
+++ b/akka-actor-tests/src/test/scala/akka/actor/DeadLetterSuspensionSpec.scala
@@ -21,11 +21,21 @@ object DeadLetterSuspensionSpec {
         context.system.eventStream.publish(Dropped(n, "Don't like numbers", self))
     }
   }
+
+  object Unandled {
+    def props(): Props = Props(new Unandled)
+  }
+
+  class Unandled extends Actor {
+    override def receive: Receive = {
+      case n: Int => unhandled(n)
+    }
+  }
 }
 
 class DeadLetterSuspensionSpec extends AkkaSpec("""
   akka.loglevel = INFO
-  akka.log-dead-letters = 3
+  akka.log-dead-letters = 4
   akka.log-dead-letters-suspend-duration = 2s
   """) with ImplicitSender {
   import DeadLetterSuspensionSpec._
@@ -36,6 +46,7 @@ class DeadLetterSuspensionSpec extends AkkaSpec("""
   expectTerminated(deadActor)
 
   private val droppingActor = system.actorOf(Dropping.props(), "droppingActor")
+  private val unhandledActor = system.actorOf(Unandled.props(), "unhandledActor")
 
   private def expectedDeadLettersLogMessage(count: Int): String =
     s"Message [java.lang.Integer] from $testActor to $deadActor was not delivered. [$count] dead letters encountered"
@@ -43,6 +54,9 @@ class DeadLetterSuspensionSpec extends AkkaSpec("""
   private def expectedDroppedLogMessage(count: Int): String =
     s"Message [java.lang.Integer] to $droppingActor was dropped. Don't like numbers. [$count] dead letters encountered"
 
+  private def expectedUnhandledLogMessage(count: Int): String =
+    s"Message [java.lang.Integer] from $testActor to $unhandledActor was unhandled. [$count] dead letters encountered"
+
   "must suspend dead-letters logging when reaching 'akka.log-dead-letters', and then re-enable" in {
     EventFilter.info(start = expectedDeadLettersLogMessage(1), occurrences = 1).intercept {
       deadActor ! 1
@@ -50,27 +64,30 @@ class DeadLetterSuspensionSpec extends AkkaSpec("""
     EventFilter.info(start = expectedDroppedLogMessage(2), occurrences = 1).intercept {
       droppingActor ! 2
     }
+    EventFilter.info(start = expectedUnhandledLogMessage(3), occurrences = 1).intercept {
+      unhandledActor ! 3
+    }
     EventFilter
-      .info(start = expectedDeadLettersLogMessage(3) + ", no more dead letters will be logged in next", occurrences = 1)
+      .info(start = expectedDeadLettersLogMessage(4) + ", no more dead letters will be logged in next", occurrences = 1)
       .intercept {
-        deadActor ! 3
+        deadActor ! 4
       }
-    deadActor ! 4
-    droppingActor ! 5
+    deadActor ! 5
+    droppingActor ! 6
 
     // let suspend-duration elapse
     Thread.sleep(2050)
 
     // re-enabled
     EventFilter
-      .info(start = expectedDeadLettersLogMessage(6) + ", of which 2 were not logged", occurrences = 1)
+      .info(start = expectedDeadLettersLogMessage(7) + ", of which 2 were not logged", occurrences = 1)
       .intercept {
-        deadActor ! 6
+        deadActor ! 7
       }
 
     // reset count
     EventFilter.info(start = expectedDeadLettersLogMessage(1), occurrences = 1).intercept {
-      deadActor ! 7
+      deadActor ! 8
     }
 
   }
diff --git a/akka-actor-tests/src/test/scala/akka/event/EventStreamSpec.scala b/akka-actor-tests/src/test/scala/akka/event/EventStreamSpec.scala
index f01139de27..0a9a279068 100644
--- a/akka-actor-tests/src/test/scala/akka/event/EventStreamSpec.scala
+++ b/akka-actor-tests/src/test/scala/akka/event/EventStreamSpec.scala
@@ -26,6 +26,7 @@ object EventStreamSpec {
         stdout-loglevel = WARNING
         loglevel = WARNING
         actor.debug.unhandled = on
+        log-dead-letters = off
       }
       """)
 
diff --git a/akka-actor-tests/src/test/scala/akka/util/ByteStringSpec.scala b/akka-actor-tests/src/test/scala/akka/util/ByteStringSpec.scala
index 48fe9fe4ea..8a816cd657 100644
--- a/akka-actor-tests/src/test/scala/akka/util/ByteStringSpec.scala
+++ b/akka-actor-tests/src/test/scala/akka/util/ByteStringSpec.scala
@@ -150,7 +150,13 @@ class ByteStringSpec extends AnyWordSpec with Matchers with Checkers {
 
   def likeVector(bs: ByteString)(body: IndexedSeq[Byte] => Any): Boolean = {
     val vec = Vector(bs: _*)
-    body(bs) == body(vec)
+    val a = body(bs)
+    val b = body(vec)
+    val result = a == b
+    if (!result) {
+      println(s"$bs => $a != $vec => $b")
+    }
+    result
   }
 
   def likeVectors(bsA: ByteString, bsB: ByteString)(body: (IndexedSeq[Byte], IndexedSeq[Byte]) => Any): Boolean = {
@@ -384,6 +390,27 @@ class ByteStringSpec extends AnyWordSpec with Matchers with Checkers {
       ByteString1.fromString("0123456789").take(3).drop(1) should ===(ByteString("12"))
       ByteString1.fromString("0123456789").take(10).take(8).drop(3).take(5) should ===(ByteString("34567"))
     }
+    "copyToArray" in {
+      val byteString = ByteString1(Array[Byte](1, 2, 3, 4, 5), startIndex = 1, length = 3)
+      def verify(f: Array[Byte] => Unit)(expected: Byte*): Unit = {
+        val array = Array.fill[Byte](3)(0)
+        f(array)
+        array should ===(expected.toArray)
+      }
+
+      verify(byteString.copyToArray(_, 0, 1))(2, 0, 0)
+      verify(byteString.copyToArray(_, 1, 1))(0, 2, 0)
+      verify(byteString.copyToArray(_, 2, 1))(0, 0, 2)
+      verify(byteString.copyToArray(_, 3, 1))(0, 0, 0)
+      verify(byteString.copyToArray(_, 0, 2))(2, 3, 0)
+      verify(byteString.copyToArray(_, 1, 2))(0, 2, 3)
+      verify(byteString.copyToArray(_, 2, 2))(0, 0, 2)
+      verify(byteString.copyToArray(_, 3, 2))(0, 0, 0)
+      verify(byteString.copyToArray(_, 0, 3))(2, 3, 4)
+      verify(byteString.copyToArray(_, 1, 3))(0, 2, 3)
+      verify(byteString.copyToArray(_, 2, 3))(0, 0, 2)
+      verify(byteString.copyToArray(_, 3, 3))(0, 0, 0)
+    }
   }
   "ByteString1C" must {
     "drop" in {
@@ -427,6 +454,27 @@ class ByteStringSpec extends AnyWordSpec with Matchers with Checkers {
       ByteString1.fromString("abcdefg").drop(2) should ===(ByteString("cdefg"))
       ByteString1.fromString("abcdefg").drop(2).take(1) should ===(ByteString("c"))
     }
+    "copyToArray" in {
+      val byteString = ByteString1C(Array[Byte](1, 2, 3))
+      def verify(f: Array[Byte] => Unit)(expected: Byte*): Unit = {
+        val array = Array.fill[Byte](3)(0)
+        f(array)
+        array should ===(expected.toArray)
+      }
+
+      verify(byteString.copyToArray(_, 0, 1))(1, 0, 0)
+      verify(byteString.copyToArray(_, 1, 1))(0, 1, 0)
+      verify(byteString.copyToArray(_, 2, 1))(0, 0, 1)
+      verify(byteString.copyToArray(_, 3, 1))(0, 0, 0)
+      verify(byteString.copyToArray(_, 0, 2))(1, 2, 0)
+      verify(byteString.copyToArray(_, 1, 2))(0, 1, 2)
+      verify(byteString.copyToArray(_, 2, 2))(0, 0, 1)
+      verify(byteString.copyToArray(_, 3, 2))(0, 0, 0)
+      verify(byteString.copyToArray(_, 0, 3))(1, 2, 3)
+      verify(byteString.copyToArray(_, 1, 3))(0, 1, 2)
+      verify(byteString.copyToArray(_, 2, 3))(0, 0, 1)
+      verify(byteString.copyToArray(_, 3, 3))(0, 0, 0)
+    }
   }
   "ByteStrings" must {
     "drop" in {
@@ -656,6 +704,28 @@ class ByteStringSpec extends AnyWordSpec with Matchers with Checkers {
       compact.indexOf('g', 5) should ===(5)
       compact.indexOf('g', 6) should ===(-1)
     }
+    "copyToArray" in {
+      val byteString = ByteString(1, 2) ++ ByteString(3) ++ ByteString(4)
+
+      def verify(f: Array[Byte] => Unit)(expected: Byte*): Unit = {
+        val array = Array.fill[Byte](3)(0)
+        f(array)
+        array should ===(expected.toArray)
+      }
+
+      verify(byteString.copyToArray(_, 0, 1))(1, 0, 0)
+      verify(byteString.copyToArray(_, 1, 1))(0, 1, 0)
+      verify(byteString.copyToArray(_, 2, 1))(0, 0, 1)
+      verify(byteString.copyToArray(_, 3, 1))(0, 0, 0)
+      verify(byteString.copyToArray(_, 0, 2))(1, 2, 0)
+      verify(byteString.copyToArray(_, 1, 2))(0, 1, 2)
+      verify(byteString.copyToArray(_, 2, 2))(0, 0, 1)
+      verify(byteString.copyToArray(_, 3, 2))(0, 0, 0)
+      verify(byteString.copyToArray(_, 0, 3))(1, 2, 3)
+      verify(byteString.copyToArray(_, 1, 3))(0, 1, 2)
+      verify(byteString.copyToArray(_, 2, 3))(0, 0, 1)
+      verify(byteString.copyToArray(_, 3, 3))(0, 0, 0)
+    }
   }
 
   "A ByteString" must {
@@ -886,7 +956,7 @@ class ByteStringSpec extends AnyWordSpec with Matchers with Checkers {
             case (xs, from, until) =>
               likeVector(xs)({ it =>
                 val array = new Array[Byte](xs.length)
-                it.slice(from, until).copyToArray(array, from, until)
+                it.copyToArray(array, from, until)
                 array.toSeq
               })
           }
@@ -1125,6 +1195,14 @@ class ByteStringSpec extends AnyWordSpec with Matchers with Checkers {
         iterator.copyToArray(array, 4, 2)
         assert(new String(array) === "123456")
       }
+
+      "calling copyToArray with length passing end of destination" in {
+        // Pre fix len passing the end of the destination would cause never ending loop inside iterator copyToArray
+        val iterator = (ByteString(1, 2) ++ ByteString(3) ++ ByteString(4)).iterator
+        val array = Array.fill[Byte](3)(0)
+        iterator.copyToArray(array, 2, 2)
+        array.toSeq should ===(Seq(0, 0, 1))
+      }
     }
 
     "decode data correctly" when {
diff --git a/akka-actor-typed-tests/src/test/java/jdocs/akka/typed/IntroTest.java b/akka-actor-typed-tests/src/test/java/jdocs/akka/typed/IntroTest.java
index 3e0bc28e38..76ba875825 100644
--- a/akka-actor-typed-tests/src/test/java/jdocs/akka/typed/IntroTest.java
+++ b/akka-actor-typed-tests/src/test/java/jdocs/akka/typed/IntroTest.java
@@ -106,36 +106,36 @@ public interface IntroTest {
 
   // #hello-world-main
   // #hello-world-main-setup
-  public class HelloWorldMain extends AbstractBehavior<HelloWorldMain.Start> {
+  public class HelloWorldMain extends AbstractBehavior<HelloWorldMain.SayHello> {
     // #hello-world-main-setup
 
-    public static class Start {
+    public static class SayHello {
       public final String name;
 
-      public Start(String name) {
+      public SayHello(String name) {
         this.name = name;
       }
     }
 
     // #hello-world-main-setup
-    public static Behavior<Start> create() {
+    public static Behavior<SayHello> create() {
       return Behaviors.setup(HelloWorldMain::new);
     }
 
     private final ActorRef<HelloWorld.Greet> greeter;
 
-    private HelloWorldMain(ActorContext<Start> context) {
+    private HelloWorldMain(ActorContext<SayHello> context) {
       super(context);
       greeter = context.spawn(HelloWorld.create(), "greeter");
     }
     // #hello-world-main-setup
 
     @Override
-    public Receive<Start> createReceive() {
-      return newReceiveBuilder().onMessage(Start.class, this::onStart).build();
+    public Receive<SayHello> createReceive() {
+      return newReceiveBuilder().onMessage(SayHello.class, this::onStart).build();
     }
 
-    private Behavior<Start> onStart(Start command) {
+    private Behavior<SayHello> onStart(SayHello command) {
       ActorRef<HelloWorld.Greeted> replyTo =
           getContext().spawn(HelloWorldBot.create(3), command.name);
       greeter.tell(new HelloWorld.Greet(command.name, replyTo));
@@ -148,35 +148,35 @@ public interface IntroTest {
 
   interface CustomDispatchersExample {
 
-    public static class Start {
+    public static class SayHello {
       public final String name;
 
-      public Start(String name) {
+      public SayHello(String name) {
         this.name = name;
       }
     }
 
     // #hello-world-main-with-dispatchers
-    public class HelloWorldMain extends AbstractBehavior<HelloWorldMain.Start> {
+    public class HelloWorldMain extends AbstractBehavior<HelloWorldMain.SayHello> {
 
       // Start message...
       // #hello-world-main-with-dispatchers
-      public static class Start {
+      public static class SayHello {
         public final String name;
 
-        public Start(String name) {
+        public SayHello(String name) {
           this.name = name;
         }
       }
       // #hello-world-main-with-dispatchers
 
-      public static Behavior<Start> create() {
+      public static Behavior<SayHello> create() {
         return Behaviors.setup(HelloWorldMain::new);
       }
 
       private final ActorRef<HelloWorld.Greet> greeter;
 
-      private HelloWorldMain(ActorContext<Start> context) {
+      private HelloWorldMain(ActorContext<SayHello> context) {
         super(context);
 
         final String dispatcherPath = "akka.actor.default-blocking-io-dispatcher";
@@ -187,7 +187,7 @@ public interface IntroTest {
       // createReceive ...
       // #hello-world-main-with-dispatchers
       @Override
-      public Receive<HelloWorldMain.Start> createReceive() {
+      public Receive<SayHello> createReceive() {
         return null;
       }
       // #hello-world-main-with-dispatchers
@@ -197,11 +197,11 @@ public interface IntroTest {
 
   public static void main(String[] args) throws Exception {
     // #hello-world
-    final ActorSystem<HelloWorldMain.Start> system =
+    final ActorSystem<HelloWorldMain.SayHello> system =
         ActorSystem.create(HelloWorldMain.create(), "hello");
 
-    system.tell(new HelloWorldMain.Start("World"));
-    system.tell(new HelloWorldMain.Start("Akka"));
+    system.tell(new HelloWorldMain.SayHello("World"));
+    system.tell(new HelloWorldMain.SayHello("Akka"));
     // #hello-world
 
     Thread.sleep(3000);
diff --git a/akka-actor-typed-tests/src/test/scala/docs/akka/typed/IntroSpec.scala b/akka-actor-typed-tests/src/test/scala/docs/akka/typed/IntroSpec.scala
index ecfe1a77b5..174684ad07 100644
--- a/akka-actor-typed-tests/src/test/scala/docs/akka/typed/IntroSpec.scala
+++ b/akka-actor-typed-tests/src/test/scala/docs/akka/typed/IntroSpec.scala
@@ -74,9 +74,9 @@ object IntroSpec {
   //#hello-world-main
   object HelloWorldMain {
 
-    final case class Start(name: String)
+    final case class SayHello(name: String)
 
-    def apply(): Behavior[Start] =
+    def apply(): Behavior[SayHello] =
       Behaviors.setup { context =>
         val greeter = context.spawn(HelloWorld(), "greeter")
 
@@ -94,10 +94,10 @@ object IntroSpec {
   object CustomDispatchersExample {
     object HelloWorldMain {
 
-      final case class Start(name: String)
+      final case class SayHello(name: String)
 
       //#hello-world-main-with-dispatchers
-      def apply(): Behavior[Start] =
+      def apply(): Behavior[SayHello] =
         Behaviors.setup { context =>
           val dispatcherPath = "akka.actor.default-blocking-io-dispatcher"
 
@@ -232,11 +232,11 @@ class IntroSpec extends ScalaTestWithActorTestKit with AnyWordSpecLike with LogC
       //#fiddle_code
       //#hello-world
 
-      val system: ActorSystem[HelloWorldMain.Start] =
+      val system: ActorSystem[HelloWorldMain.SayHello] =
         ActorSystem(HelloWorldMain(), "hello")
 
-      system ! HelloWorldMain.Start("World")
-      system ! HelloWorldMain.Start("Akka")
+      system ! HelloWorldMain.SayHello("World")
+      system ! HelloWorldMain.SayHello("Akka")
 
       //#hello-world
       //#fiddle_code
diff --git a/akka-actor/src/main/resources/reference.conf b/akka-actor/src/main/resources/reference.conf
index 968e32b19c..31f3e3c176 100644
--- a/akka-actor/src/main/resources/reference.conf
+++ b/akka-actor/src/main/resources/reference.conf
@@ -47,7 +47,8 @@ akka {
   # This is useful when you are uncertain of what configuration is used.
   log-config-on-start = off
 
-  # Log at info level when messages are sent to dead letters.
+  # Log at info level when messages are sent to dead letters, or published to
+  # eventStream as `DeadLetter`, `Dropped` or `UnhandledMessage`.
   # Possible values:
   # on: all dead letters are logged
   # off: no logging of dead letters
diff --git a/akka-actor/src/main/scala-2.12/akka/util/ByteIterator.scala b/akka-actor/src/main/scala-2.12/akka/util/ByteIterator.scala
index 1e2e27d6da..aaac46b5d5 100644
--- a/akka-actor/src/main/scala-2.12/akka/util/ByteIterator.scala
+++ b/akka-actor/src/main/scala-2.12/akka/util/ByteIterator.scala
@@ -300,7 +300,7 @@ object ByteIterator {
     final override def copyToArray[B >: Byte](xs: Array[B], start: Int, len: Int): Unit = {
       var pos = start
       var rest = len
-      while ((rest > 0) && !iterators.isEmpty) {
+      while ((rest > 0) && !iterators.isEmpty && pos < xs.length) {
         val n = 0 max ((xs.length - pos) min current.len min rest)
         current.copyToArray(xs, pos, n)
         pos += n
diff --git a/akka-actor/src/main/scala-2.13+/akka/util/ByteIterator.scala b/akka-actor/src/main/scala-2.13+/akka/util/ByteIterator.scala
index cd63f960f6..4f15f7e147 100644
--- a/akka-actor/src/main/scala-2.13+/akka/util/ByteIterator.scala
+++ b/akka-actor/src/main/scala-2.13+/akka/util/ByteIterator.scala
@@ -309,7 +309,7 @@ object ByteIterator {
     final override def copyToArray[B >: Byte](xs: Array[B], start: Int, len: Int): Int = {
       var pos = start
       var rest = len
-      while ((rest > 0) && !iterators.isEmpty) {
+      while ((rest > 0) && !iterators.isEmpty && pos < xs.length) {
         val n = 0 max ((xs.length - pos) min current.len min rest)
         current.copyToArray(xs, pos, n)
         pos += n
diff --git a/akka-actor/src/main/scala-2.13+/akka/util/ByteString.scala b/akka-actor/src/main/scala-2.13+/akka/util/ByteString.scala
index 8c2eac8e57..614d0e1bdc 100644
--- a/akka-actor/src/main/scala-2.13+/akka/util/ByteString.scala
+++ b/akka-actor/src/main/scala-2.13+/akka/util/ByteString.scala
@@ -253,11 +253,11 @@ object ByteString {
     }
 
     override def copyToArray[B >: Byte](dest: Array[B], start: Int, len: Int): Int = {
-      val copied = math.min(math.min(len, bytes.length), dest.length - start)
-      if (copied > 0) {
-        System.arraycopy(bytes, 0, dest, start, copied)
+      val toCopy = math.min(math.min(len, bytes.length), dest.length - start)
+      if (toCopy > 0) {
+        Array.copy(bytes, 0, dest, start, toCopy)
       }
-      copied
+      toCopy
     }
 
   }
@@ -395,11 +395,11 @@ object ByteString {
 
     override def copyToArray[B >: Byte](dest: Array[B], start: Int, len: Int): Int = {
       // min of the bytes available to copy, bytes there is room for in dest and the requested number of bytes
-      val copied = math.max(math.min(math.min(len, length), dest.length - start), 0)
-      if (copied > 0) {
-        System.arraycopy(bytes, 0, dest, start, copied)
+      val toCopy = math.min(math.min(len, length), dest.length - start)
+      if (toCopy > 0) {
+        Array.copy(bytes, startIndex, dest, start, toCopy)
       }
-      copied
+      toCopy
     }
 
     protected def writeReplace(): AnyRef = new SerializationProxy(this)
@@ -645,20 +645,19 @@ object ByteString {
     }
 
     override def copyToArray[B >: Byte](dest: Array[B], start: Int, len: Int): Int = {
-      if (isCompact) bytestrings.head.copyToArray(dest, start, len)
+      if (bytestrings.size == 1) bytestrings.head.copyToArray(dest, start, len)
       else {
-        // min of the bytes available top copy, bytes there is room for in dest and the requested number of bytes
-        val copied = math.min(math.min(len, length), dest.length - start)
-        if (copied > 0) {
+        // min of the bytes available to copy, bytes there is room for in dest and the requested number of bytes
+        val totalToCopy = math.min(math.min(len, length), dest.length - start)
+        if (totalToCopy > 0) {
           val bsIterator = bytestrings.iterator
-          var pos = 0
-          while (pos < copied) {
+          var copied = 0
+          while (copied < totalToCopy) {
             val current = bsIterator.next()
-            val copied = current.copyToArray(dest, pos, len - pos)
-            pos += copied
+            copied += current.copyToArray(dest, start + copied, totalToCopy - copied)
           }
         }
-        copied
+        totalToCopy
       }
     }
 
diff --git a/akka-actor/src/main/scala/akka/actor/Actor.scala b/akka-actor/src/main/scala/akka/actor/Actor.scala
index aeb93e95bd..18c6001a78 100644
--- a/akka-actor/src/main/scala/akka/actor/Actor.scala
+++ b/akka-actor/src/main/scala/akka/actor/Actor.scala
@@ -289,6 +289,7 @@ final case class UnhandledMessage(
     @BeanProperty recipient: ActorRef)
     extends NoSerializationVerificationNeeded
     with WrappedMessage
+    with AllDeadLetters
 
 /**
  * Classes for passing status back to the sender.
diff --git a/akka-actor/src/main/scala/akka/actor/ActorRef.scala b/akka-actor/src/main/scala/akka/actor/ActorRef.scala
index 24ea086b3c..83c9ff47a3 100644
--- a/akka-actor/src/main/scala/akka/actor/ActorRef.scala
+++ b/akka-actor/src/main/scala/akka/actor/ActorRef.scala
@@ -7,10 +7,11 @@ package akka.actor
 import java.util.concurrent.ConcurrentHashMap
 
 import akka.annotation.InternalApi
-
 import scala.annotation.tailrec
 import scala.collection.immutable
 import scala.util.control.NonFatal
+
+import akka.annotation.DoNotInherit
 import akka.dispatch._
 import akka.dispatch.sysmsg._
 import akka.event.AddressTerminatedTopic
@@ -478,8 +479,11 @@ private[akka] trait MinimalActorRef extends InternalActorRef with LocalRef {
 /**
  * Subscribe to this class to be notified about all [[DeadLetter]] (also the suppressed ones)
  * and [[Dropped]].
+ *
+ * Not for user extension
  */
-sealed trait AllDeadLetters extends WrappedMessage {
+@DoNotInherit
+trait AllDeadLetters extends WrappedMessage {
   def message: Any
   def sender: ActorRef
   def recipient: ActorRef
diff --git a/akka-actor/src/main/scala/akka/event/DeadLetterListener.scala b/akka-actor/src/main/scala/akka/event/DeadLetterListener.scala
index fb7649b409..0455a5f11d 100644
--- a/akka-actor/src/main/scala/akka/event/DeadLetterListener.scala
+++ b/akka-actor/src/main/scala/akka/event/DeadLetterListener.scala
@@ -15,6 +15,7 @@ import akka.actor.DeadLetter
 import akka.actor.DeadLetterActorRef
 import akka.actor.DeadLetterSuppression
 import akka.actor.Dropped
+import akka.actor.UnhandledMessage
 import akka.actor.WrappedMessage
 import akka.event.Logging.Info
 import akka.util.PrettyDuration._
@@ -29,6 +30,7 @@ class DeadLetterListener extends Actor {
   override def preStart(): Unit = {
     eventStream.subscribe(self, classOf[DeadLetter])
     eventStream.subscribe(self, classOf[Dropped])
+    eventStream.subscribe(self, classOf[UnhandledMessage])
   }
 
   // don't re-subscribe, skip call to preStart
@@ -115,6 +117,10 @@ class DeadLetterListener extends Actor {
         val destination = if (isReal(d.recipient)) s" to ${d.recipient}" else ""
         s"Message [$messageStr]$wrappedIn$origin$destination was dropped. ${dropped.reason}. " +
         s"[$count] dead letters encountered$doneMsg. "
+      case _: UnhandledMessage =>
+        val destination = if (isReal(d.recipient)) s" to ${d.recipient}" else ""
+        s"Message [$messageStr]$wrappedIn$origin$destination was unhandled. " +
+        s"[$count] dead letters encountered$doneMsg. "
       case _ =>
         s"Message [$messageStr]$wrappedIn$origin to ${d.recipient} was not delivered. " +
         s"[$count] dead letters encountered$doneMsg. " +
diff --git a/akka-actor/src/main/scala/akka/event/Logging.scala b/akka-actor/src/main/scala/akka/event/Logging.scala
index c2703d7929..5cd62aab21 100644
--- a/akka-actor/src/main/scala/akka/event/Logging.scala
+++ b/akka-actor/src/main/scala/akka/event/Logging.scala
@@ -1637,6 +1637,8 @@ class LogMarker(val name: String, val properties: Map[String, Any]) {
     import akka.util.ccompat.JavaConverters._
     properties.map { case (k, v) => (k, v.asInstanceOf[AnyRef]) }.asJava
   }
+
+  override def toString: String = s"LogMarker($name,$properties)"
 }
 
 object LogMarker {
diff --git a/akka-actor/src/main/scala/akka/pattern/CircuitBreaker.scala b/akka-actor/src/main/scala/akka/pattern/CircuitBreaker.scala
index 9caa219b3c..005f45f594 100644
--- a/akka-actor/src/main/scala/akka/pattern/CircuitBreaker.scala
+++ b/akka-actor/src/main/scala/akka/pattern/CircuitBreaker.scala
@@ -116,8 +116,8 @@ object CircuitBreaker {
 }
 
 /**
- * Provides circuit breaker functionality to provide stability when working with "dangerous" operations, e.g. calls to
- * remote systems
+ * Provides circuit breaker functionality for stability when working with "dangerous" operations, e.g. calls to
+ * remote systems.
  *
  * Transitions through three states:
  * - In *Closed* state, calls pass through until the `maxFailures` count is reached.  This causes the circuit breaker
@@ -244,7 +244,7 @@ class CircuitBreaker(
     Unsafe.instance.getObjectVolatile(this, AbstractCircuitBreaker.resetTimeoutOffset).asInstanceOf[FiniteDuration]
 
   /**
-   * Wraps invocations of asynchronous calls that need to be protected
+   * Wraps invocations of asynchronous calls that need to be protected.
    *
    * @param body Call needing protected
    * @param defineFailureFn function that define what should be consider failure and thus increase failure count
@@ -255,7 +255,7 @@ class CircuitBreaker(
     currentState.invoke(body, defineFailureFn)
 
   /**
-   * Wraps invocations of asynchronous calls that need to be protected
+   * Wraps invocations of asynchronous calls that need to be protected.
    *
    * @param body Call needing protected
    * @return [[scala.concurrent.Future]] containing the call result or a
@@ -266,7 +266,7 @@ class CircuitBreaker(
     currentState.invoke(body, CircuitBreaker.exceptionAsFailure)
 
   /**
-   * Java API for [[#withCircuitBreaker]]
+   * Java API for [[#withCircuitBreaker]].
    *
    * @param body Call needing protected
    * @return [[scala.concurrent.Future]] containing the call result or a
@@ -276,7 +276,7 @@ class CircuitBreaker(
     callWithCircuitBreaker(body, CircuitBreaker.exceptionAsFailureJava[T])
 
   /**
-   * Java API for [[#withCircuitBreaker]]
+   * Java API for [[#withCircuitBreaker]].
    *
    * @param body Call needing protected
    * @param defineFailureFn function that define what should be consider failure and thus increase failure count
@@ -292,7 +292,7 @@ class CircuitBreaker(
   }
 
   /**
-   * Java API (8) for [[#withCircuitBreaker]]
+   * Java API (8) for [[#withCircuitBreaker]].
    *
    * @param body Call needing protected
    * @return [[java.util.concurrent.CompletionStage]] containing the call result or a
@@ -302,7 +302,7 @@ class CircuitBreaker(
     callWithCircuitBreakerCS(body, CircuitBreaker.exceptionAsFailureJava)
 
   /**
-   * Java API (8) for [[#withCircuitBreaker]]
+   * Java API (8) for [[#withCircuitBreaker]].
    *
    * @param body Call needing protected
    * @param defineFailureFn function that define what should be consider failure and thus increase failure count
@@ -317,10 +317,10 @@ class CircuitBreaker(
     }, defineFailureFn))
 
   /**
-   * Wraps invocations of synchronous calls that need to be protected
+   * Wraps invocations of synchronous calls that need to be protected.
    *
-   * Calls are run in caller's thread. Because of the synchronous nature of
-   * this call the  `scala.concurrent.TimeoutException` will only be thrown
+   * Calls are run in the caller's thread. Because of the synchronous nature of
+   * this call, the `scala.concurrent.TimeoutException` will only be thrown
    * after the body has completed.
    *
    * Throws java.util.concurrent.TimeoutException if the call timed out.
@@ -332,7 +332,7 @@ class CircuitBreaker(
     withSyncCircuitBreaker(body, CircuitBreaker.exceptionAsFailure)
 
   /**
-   * Wraps invocations of synchronous calls that need to be protected
+   * Wraps invocations of synchronous calls that need to be protected.
    *
    * Calls are run in caller's thread. Because of the synchronous nature of
    * this call the  `scala.concurrent.TimeoutException` will only be thrown
@@ -510,7 +510,7 @@ class CircuitBreaker(
   }
 
   /**
-   * Adds a callback to execute when call finished with failure.
+   * Adds a callback to execute if the call finished with failure.
    *
    * The callback is run in the [[scala.concurrent.ExecutionContext]] supplied in the constructor.
    *
@@ -523,7 +523,7 @@ class CircuitBreaker(
     })
 
   /**
-   * JavaAPI for onCallFailure
+   * JavaAPI for onCallFailure.
    *
    * @param callback Handler to be invoked on failed call, where passed value is elapsed time in nanoseconds.
    * @return CircuitBreaker for fluent usage
@@ -534,7 +534,7 @@ class CircuitBreaker(
   }
 
   /**
-   * Adds a callback to execute when call finished with timeout.
+   * Adds a callback to execute if a call finished with timeout.
    *
    * The callback is run in the [[scala.concurrent.ExecutionContext]] supplied in the constructor.
    *
@@ -547,7 +547,7 @@ class CircuitBreaker(
     })
 
   /**
-   * JavaAPI for onCallTimeout
+   * JavaAPI for onCallTimeout.
    *
    * @param callback Handler to be invoked on call finished with timeout, where passed value is elapsed time in nanoseconds.
    * @return CircuitBreaker for fluent usage
@@ -558,7 +558,7 @@ class CircuitBreaker(
   }
 
   /**
-   * Adds a callback to execute when call was failed due to open breaker.
+   * Adds a callback to execute if call was failed due to open breaker.
    *
    * The callback is run in the [[scala.concurrent.ExecutionContext]] supplied in the constructor.
    *
@@ -607,7 +607,6 @@ class CircuitBreaker(
 
   /**
    * Resets breaker to a closed state.  This is valid from an Half-Open state only.
-   *
    */
   private def resetBreaker(): Unit = transition(HalfOpen, Closed)
 
@@ -672,7 +671,6 @@ class CircuitBreaker(
 
   /**
    * Attempts to reset breaker by transitioning to a half-open state.  This is valid from an Open state only.
-   *
    */
   private def attemptReset(): Unit = transition(Open, HalfOpen)
 
diff --git a/akka-docs/src/main/paradox/common/circuitbreaker.md b/akka-docs/src/main/paradox/common/circuitbreaker.md
index deb957dba1..220deae574 100644
--- a/akka-docs/src/main/paradox/common/circuitbreaker.md
+++ b/akka-docs/src/main/paradox/common/circuitbreaker.md
@@ -92,7 +92,7 @@ Java
 
 @@@ note
 
-Using the `CircuitBreaker` companion object's @scala[*apply*]@java[*create*] method
+Using the `CircuitBreaker`'s companion object @scala[*apply*]@java[*create*] method
 will return a `CircuitBreaker` where callbacks are executed in the caller's thread.
 This can be useful if the asynchronous `Future` behavior is unnecessary, for
 example invoking a synchronous-only API.
@@ -101,11 +101,11 @@ example invoking a synchronous-only API.
 
 ### Control failure count explicitly
 
-By default, the circuit breaker treat `Exception` as failure in synchronized API, or failed `Future` as failure in future based API.
-Failure will increment failure count, when failure count reach the *maxFailures*, circuit breaker will be opened.
-However, some applications might requires certain exception to not increase failure count, or vice versa,
-sometime we want to increase the failure count even if the call succeeded.
-Akka circuit breaker provides a way to achieve such use case:
+By default, the circuit breaker treats `Exception` as failure in synchronized API, or failed `Future` as failure in future based API.
+On failure, the failure count will increment. If the failure count reaches the *maxFailures*, the circuit breaker will be opened.
+However, some applications may require certain exceptions to not increase the failure count.
+In other cases one may want to increase the failure count even if the call succeeded.
+Akka circuit breaker provides a way to achieve such use cases:
 
 * `withCircuitBreaker`
 * `withSyncCircuitBreaker`
@@ -113,7 +113,7 @@ Akka circuit breaker provides a way to achieve such use case:
 * `callWithCircuitBreakerCS`
 * `callWithSyncCircuitBreaker`
 
-All methods above accepts an argument `defineFailureFn`
+All methods above accept an argument `defineFailureFn`
 
 Type of `defineFailureFn`: @scala[`Try[T] => Boolean`]@java[`BiFunction[Optional[T], Optional[Throwable], java.lang.Boolean]`]
 
@@ -128,9 +128,14 @@ Java
 
 ### Low level API
 
-The low-level API allows you to describe the behavior of the CircuitBreaker in detail, including deciding what to return to the calling `Actor` in case of success or failure. This is especially useful when expecting the remote call to send a reply. CircuitBreaker doesn't support `Tell Protection` (protecting against calls that expect a reply) natively at the moment, so you need to use the low-level power-user APIs, `succeed`  and  `fail` methods, as well as `isClose`, `isOpen`, `isHalfOpen` to implement it.
+The low-level API allows you to describe the behavior of the CircuitBreaker in detail, including deciding what to return to the calling `Actor` in case of success or failure. This is especially useful when expecting the remote call to send a reply.
+CircuitBreaker doesn't support `Tell Protection` (protecting against calls that expect a reply) natively at the moment.
+Thus you need to use the low-level power-user APIs, `succeed`  and  `fail` methods, as well as `isClose`, `isOpen`, `isHalfOpen` to implement it.
 
-As can be seen in the examples below, a `Tell Protection` pattern could be implemented by using the `succeed` and `fail` methods, which would count towards the `CircuitBreaker` counts. In the example, a call is made to the remote service if the `breaker.isClosed`, and once a response is received, the `succeed` method is invoked, which tells the `CircuitBreaker` to keep the breaker closed. If on the other hand an error or timeout is received, we trigger a `fail` and the breaker accrues this failure towards its count for opening the breaker.
+As can be seen in the examples below, a `Tell Protection` pattern could be implemented by using the `succeed` and `fail` methods, which would count towards the `CircuitBreaker` counts. 
+In the example, a call is made to the remote service if the `breaker.isClosed`. 
+Once a response is received, the `succeed` method is invoked, which tells the `CircuitBreaker` to keep the breaker closed. 
+On the other hand, if an error or timeout is received we trigger a `fail`, and the breaker accrues this failure towards its count for opening the breaker.
 
 @@@ note
 
diff --git a/akka-docs/src/main/paradox/dispatchers.md b/akka-docs/src/main/paradox/dispatchers.md
index 6530aa312c..8146f0e7e3 100644
--- a/akka-docs/src/main/paradox/dispatchers.md
+++ b/akka-docs/src/main/paradox/dispatchers.md
@@ -48,7 +48,7 @@ Another example that uses the "thread-pool-executor":
 
 @@@ note
 
-The thread pool executor dispatcher is implemented using by a `java.util.concurrent.ThreadPoolExecutor`.
+The thread pool executor dispatcher is implemented using a `java.util.concurrent.ThreadPoolExecutor`.
 You can read more about it in the JDK's [ThreadPoolExecutor documentation](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.html).
 
 @@@
diff --git a/akka-docs/src/main/paradox/logging.md b/akka-docs/src/main/paradox/logging.md
index 0552d47b31..0f3d0bf1b6 100644
--- a/akka-docs/src/main/paradox/logging.md
+++ b/akka-docs/src/main/paradox/logging.md
@@ -50,18 +50,18 @@ class MyActor extends Actor with akka.actor.ActorLogging {
 @@@
 
 The first parameter to @scala[`Logging`] @java[`Logging.getLogger`] could also be any
-`LoggingBus`, specifically @scala[`system.eventStream`] @scala[`system.eventStream()`]; in the demonstrated
-case, the actor system's address is included in the `akkaSource`
-representation of the log source (see @ref:[Logging Thread, Akka Source and Actor System in MDC](#logging-thread-akka-source-and-actor-system-in-mdc))
+`LoggingBus`, specifically @scala[`system.eventStream`] @scala[`system.eventStream()`]. 
+In the demonstrated case, the actor system's address is included in the `akkaSource`
+representation of the log source (see @ref:[Logging Thread, Akka Source and Actor System in MDC](#logging-thread-akka-source-and-actor-system-in-mdc)),
 while in the second case this is not automatically done.
 The second parameter to @scala[`Logging`] @java[`Logging.getLogger`] is the source of this logging channel.
 The source object is translated to a String according to the following rules:
 
  * if it is an Actor or ActorRef, its path is used
  * in case of a String it is used as is
- * in case of a class an approximation of its simpleName
- * and in all other cases @scala[a compile error occurs unless an implicit
-`LogSource[T]` is in scope for the type in question] @java[the simpleName of its class]
+ * in case of a Class an approximation of its `simpleName` is used
+ * in all other cases @scala[a compile error occurs unless an implicit
+`LogSource[T]` is in scope for the type in question] @java[the `simpleName` of its class] is used
 
 The log message may contain argument placeholders `{}`, which will be
 substituted if the log level is enabled. Giving more arguments than
diff --git a/akka-docs/src/main/paradox/project/migration-guide-2.5.x-2.6.x.md b/akka-docs/src/main/paradox/project/migration-guide-2.5.x-2.6.x.md
index 2737512567..d6c6ec0bcc 100644
--- a/akka-docs/src/main/paradox/project/migration-guide-2.5.x-2.6.x.md
+++ b/akka-docs/src/main/paradox/project/migration-guide-2.5.x-2.6.x.md
@@ -3,6 +3,9 @@ project.description: Migrating to Akka 2.6.
 ---
 # Migration Guide 2.5.x to 2.6.x
 
+An overview of the changes in Akka 2.6 is presented in the [What's new in Akka 2.6 video](https://akka.io/blog/news/2019/12/12/akka-26-intro)
+and the [release announcement](https://akka.io/blog/news/2019/11/06/akka-2.6.0-released).
+
 Akka 2.6.x is binary backwards compatible with 2.5.x with the ordinary exceptions listed in the
 @ref:[Binary Compatibility Rules](../common/circuitbreaker.md).
 
diff --git a/akka-docs/src/main/paradox/stream/operators/Source-or-Flow/splitAfter.md b/akka-docs/src/main/paradox/stream/operators/Source-or-Flow/splitAfter.md
index 229c3bbd15..a71b8b3eb2 100644
--- a/akka-docs/src/main/paradox/stream/operators/Source-or-Flow/splitAfter.md
+++ b/akka-docs/src/main/paradox/stream/operators/Source-or-Flow/splitAfter.md
@@ -16,6 +16,19 @@ End the current substream whenever a predicate returns `true`, starting a new su
 
 End the current substream whenever a predicate returns `true`, starting a new substream for the next element.
 
+## Example
+
+Given some time series data source we would like to split the stream into sub-streams for each second.
+By using `sliding` we can compare the timestamp of the current and next element to decide when to split.
+
+Scala
+:  @@snip [Scan.scala](/akka-docs/src/test/scala/docs/stream/operators/sourceorflow/Split.scala) { #splitAfter }
+
+Java
+:  @@snip [SourceOrFlow.java](/akka-docs/src/test/java/jdocs/stream/operators/sourceorflow/Split.java) { #splitAfter }
+
+An alternative way of implementing this is shown in @ref:[splitWhen example](splitWhen.md#example).
+
 ## Reactive Streams semantics
 
 @@@div { .callout }
diff --git a/akka-docs/src/main/paradox/stream/operators/Source-or-Flow/splitWhen.md b/akka-docs/src/main/paradox/stream/operators/Source-or-Flow/splitWhen.md
index df0f131146..609afe8ca2 100644
--- a/akka-docs/src/main/paradox/stream/operators/Source-or-Flow/splitWhen.md
+++ b/akka-docs/src/main/paradox/stream/operators/Source-or-Flow/splitWhen.md
@@ -16,6 +16,20 @@ Split off elements into a new substream whenever a predicate function return `tr
 
 Split off elements into a new substream whenever a predicate function return `true`.
 
+## Example
+
+Given some time series data source we would like to split the stream into sub-streams for each second.
+We need to compare the timestamp of the previous and current element to decide when to split. This
+decision can be implemented in a `statefulMapConcat` operator preceding the `splitWhen`.  
+
+Scala
+:  @@snip [Scan.scala](/akka-docs/src/test/scala/docs/stream/operators/sourceorflow/Split.scala) { #splitWhen }
+
+Java
+:  @@snip [SourceOrFlow.java](/akka-docs/src/test/java/jdocs/stream/operators/sourceorflow/Split.java) { #splitWhen }
+
+An alternative way of implementing this is shown in @ref:[splitAfter example](splitAfter.md#example).
+
 ## Reactive Streams semantics
 
 @@@div { .callout }
diff --git a/akka-docs/src/main/paradox/typed/actors.md b/akka-docs/src/main/paradox/typed/actors.md
index 8baa98706b..2c3d16b9e0 100644
--- a/akka-docs/src/main/paradox/typed/actors.md
+++ b/akka-docs/src/main/paradox/typed/actors.md
@@ -34,7 +34,8 @@ systems. The API of Akka’s Actors has borrowed some of its syntax from Erlang.
 ## First example
 
 If you are new to Akka you might want to start with reading the @ref:[Getting Started Guide](guide/introduction.md)
-and then come back here to learn more. 
+and then come back here to learn more. We also recommend watching the short 
+[introduction video to Akka actors](https://akka.io/blog/news/2019/12/03/akka-typed-actor-intro-video).  
 
 It is helpful to become familiar with the foundational, external and internal
 ecosystem of your Actors, to see what you can leverage and customize as needed, see
@@ -132,7 +133,7 @@ Scala
 Java
 :  @@snip [IntroSpec.scala](/akka-actor-typed-tests/src/test/java/jdocs/akka/typed/IntroTest.java) { #hello-world }
 
-We start an Actor system from the defined `HelloWorldMain` behavior and send two `Start` messages that
+We start an Actor system from the defined `HelloWorldMain` behavior and send two `SayHello` messages that
 will kick-off the interaction between two separate `HelloWorldBot` actors and the single `Greeter` actor.
 
 An application normally consists of a single `ActorSystem`, running many actors, per JVM. 
diff --git a/akka-docs/src/main/paradox/typed/cluster-sharding.md b/akka-docs/src/main/paradox/typed/cluster-sharding.md
index 6c10cc5f8a..9355d143d3 100644
--- a/akka-docs/src/main/paradox/typed/cluster-sharding.md
+++ b/akka-docs/src/main/paradox/typed/cluster-sharding.md
@@ -27,6 +27,9 @@ It could for example be actors representing Aggregate Roots in Domain-Driven Des
 Here we call these actors "entities". These actors typically have persistent (durable) state,
 but this feature is not limited to actors with persistent state.
 
+The [Introduction to Akka Cluster Sharding video](https://akka.io/blog/news/2019/12/16/akka-cluster-sharding-intro-video)
+is a good starting point for learning Cluster Sharding.
+
 Cluster sharding is typically used when you have many stateful actors that together consume
 more resources (e.g. memory) than fit on one machine. If you only have a few stateful actors
 it might be easier to run them on a @ref:[Cluster Singleton](cluster-singleton.md) node. 
diff --git a/akka-docs/src/main/paradox/typed/dispatchers.md b/akka-docs/src/main/paradox/typed/dispatchers.md
index 40fe453edd..715d56e438 100644
--- a/akka-docs/src/main/paradox/typed/dispatchers.md
+++ b/akka-docs/src/main/paradox/typed/dispatchers.md
@@ -209,8 +209,8 @@ The thread information was recorded using the YourKit profiler, however any good
 has this feature (including the free and bundled with the Oracle JDK [VisualVM](https://visualvm.github.io/), as well as [Java Mission Control](https://openjdk.java.net/projects/jmc/)).
 
 The orange portion of the thread shows that it is idle. Idle threads are fine -
-they're ready to accept new work. However, large amount of turquoise (blocked, or sleeping as in our example) threads
-is very bad and leads to thread starvation.
+they're ready to accept new work. However, a large number of turquoise (blocked, or sleeping as in our example) threads
+leads to thread starvation.
 
 @@@ note
 
@@ -267,7 +267,7 @@ unless you @ref:[set up a separate dispatcher for the actor](../dispatchers.md#s
 
 ### Solution: Dedicated dispatcher for blocking operations
 
-One of the most efficient methods of isolating the blocking behavior such that it does not impact the rest of the system
+One of the most efficient methods of isolating the blocking behavior, such that it does not impact the rest of the system,
 is to prepare and use a dedicated dispatcher for all those blocking operations.
 This technique is often referred to as "bulk-heading" or simply "isolating blocking".
 
diff --git a/akka-docs/src/main/paradox/typed/persistence.md b/akka-docs/src/main/paradox/typed/persistence.md
index a7af0457ba..1f0780986b 100644
--- a/akka-docs/src/main/paradox/typed/persistence.md
+++ b/akka-docs/src/main/paradox/typed/persistence.md
@@ -30,6 +30,9 @@ allows for very high transaction rates and efficient replication. A stateful act
 events to the actor, allowing it to rebuild its state. This can be either the full history of changes
 or starting from a checkpoint in a snapshot which can dramatically reduce recovery times.
 
+The [Event Sourcing with Akka 2.6 video](https://akka.io/blog/news/2020/01/07/akka-event-sourcing-video)
+is a good starting point for learning Event Sourcing.
+
 @@@ note
 
 The General Data Protection Regulation (GDPR) requires that personal information must be deleted at the request of users.
diff --git a/akka-docs/src/test/java/jdocs/stream/operators/sourceorflow/Split.java b/akka-docs/src/test/java/jdocs/stream/operators/sourceorflow/Split.java
new file mode 100644
index 0000000000..f9530d3bb8
--- /dev/null
+++ b/akka-docs/src/test/java/jdocs/stream/operators/sourceorflow/Split.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2020 Lightbend Inc. <https://www.lightbend.com>
+ */
+
+package jdocs.stream.operators.sourceorflow;
+
+import akka.actor.ActorSystem;
+import akka.japi.Pair;
+import akka.japi.function.Creator;
+import akka.japi.function.Function;
+import akka.stream.javadsl.Sink;
+import akka.stream.javadsl.Source;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+import java.util.Collections;
+
+public class Split {
+  public static void splitWhenExample(String[] args) {
+    ActorSystem system = ActorSystem.create();
+
+    // #splitWhen
+    Source.range(1, 100)
+        .throttle(1, Duration.ofMillis(100))
+        .map(elem -> new Pair<>(elem, Instant.now()))
+        .statefulMapConcat(
+            () -> {
+              return new Function<Pair<Integer, Instant>, Iterable<Pair<Integer, Boolean>>>() {
+                // stateful decision in statefulMapConcat
+                // keep track of time bucket (one per second)
+                LocalDateTime currentTimeBucket =
+                    LocalDateTime.ofInstant(Instant.ofEpochMilli(0), ZoneOffset.UTC);
+
+                @Override
+                public Iterable<Pair<Integer, Boolean>> apply(
+                    Pair<Integer, Instant> elemTimestamp) {
+                  LocalDateTime time =
+                      LocalDateTime.ofInstant(elemTimestamp.second(), ZoneOffset.UTC);
+                  LocalDateTime bucket = time.withNano(0);
+                  boolean newBucket = !bucket.equals(currentTimeBucket);
+                  if (newBucket) currentTimeBucket = bucket;
+                  return Collections.singleton(new Pair<>(elemTimestamp.first(), newBucket));
+                }
+              };
+            })
+        .splitWhen(elemDecision -> elemDecision.second()) // split when time bucket changes
+        .map(elemDecision -> elemDecision.first())
+        .fold(0, (acc, notUsed) -> acc + 1) // sum
+        .to(Sink.foreach(System.out::println))
+        .run(system);
+    // 3
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 7
+    // #splitWhen
+  }
+
+  public static void splitAfterExample(String[] args) {
+    ActorSystem system = ActorSystem.create();
+
+    // #splitAfter
+    Source.range(1, 100)
+        .throttle(1, Duration.ofMillis(100))
+        .map(elem -> new Pair<>(elem, Instant.now()))
+        .sliding(2, 1)
+        .splitAfter(
+            slidingElements -> {
+              if (slidingElements.size() == 2) {
+                Pair<Integer, Instant> current = slidingElements.get(0);
+                Pair<Integer, Instant> next = slidingElements.get(1);
+                LocalDateTime currentBucket =
+                    LocalDateTime.ofInstant(current.second(), ZoneOffset.UTC).withNano(0);
+                LocalDateTime nextBucket =
+                    LocalDateTime.ofInstant(next.second(), ZoneOffset.UTC).withNano(0);
+                return !currentBucket.equals(nextBucket);
+              } else {
+                return false;
+              }
+            })
+        .map(slidingElements -> slidingElements.get(0).first())
+        .fold(0, (acc, notUsed) -> acc + 1) // sum
+        .to(Sink.foreach(System.out::println))
+        .run(system);
+    // 3
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 6
+    // note that the very last element is never included due to sliding,
+    // but that would not be problem for an infinite stream
+    // #splitAfter
+  }
+}
diff --git a/akka-docs/src/test/scala/docs/stream/operators/sourceorflow/Split.scala b/akka-docs/src/test/scala/docs/stream/operators/sourceorflow/Split.scala
new file mode 100644
index 0000000000..fed0a0fe6b
--- /dev/null
+++ b/akka-docs/src/test/scala/docs/stream/operators/sourceorflow/Split.scala
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2019-2020 Lightbend Inc. <https://www.lightbend.com>
+ */
+
+package docs.stream.operators.sourceorflow
+
+import java.time.Instant
+import java.time.LocalDateTime
+import java.time.ZoneOffset
+
+import scala.concurrent.duration._
+
+import akka.stream.scaladsl.Sink
+import akka.stream.scaladsl.Source
+
+object Split {
+  def splitWhenExample(args: Array[String]): Unit = {
+    import akka.actor.ActorSystem
+
+    implicit val system: ActorSystem = ActorSystem()
+
+    //#splitWhen
+    Source(1 to 100)
+      .throttle(1, 100.millis)
+      .map(elem => (elem, Instant.now()))
+      .statefulMapConcat(() => {
+        // stateful decision in statefulMapConcat
+        // keep track of time bucket (one per second)
+        var currentTimeBucket = LocalDateTime.ofInstant(Instant.ofEpochMilli(0), ZoneOffset.UTC)
+
+        {
+          case (elem, timestamp) =>
+            val time = LocalDateTime.ofInstant(timestamp, ZoneOffset.UTC)
+            val bucket = time.withNano(0)
+            val newBucket = bucket != currentTimeBucket
+            if (newBucket)
+              currentTimeBucket = bucket
+            List((elem, newBucket))
+        }
+      })
+      .splitWhen(_._2) // split when time bucket changes
+      .map(_._1)
+      .fold(0)((acc, _) => acc + 1) // sum
+      .to(Sink.foreach(println))
+      .run()
+    // 3
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 7
+    //#splitWhen
+  }
+
+  def splitAfterExample(args: Array[String]): Unit = {
+    import akka.actor.ActorSystem
+
+    implicit val system: ActorSystem = ActorSystem()
+
+    //#splitAfter
+    Source(1 to 100)
+      .throttle(1, 100.millis)
+      .map(elem => (elem, Instant.now()))
+      .sliding(2)
+      .splitAfter { slidingElements =>
+        if (slidingElements.size == 2) {
+          val current = slidingElements.head
+          val next = slidingElements.tail.head
+          val currentBucket = LocalDateTime.ofInstant(current._2, ZoneOffset.UTC).withNano(0)
+          val nextBucket = LocalDateTime.ofInstant(next._2, ZoneOffset.UTC).withNano(0)
+          currentBucket != nextBucket
+        } else {
+          false
+        }
+      }
+      .map(_.head._1)
+      .fold(0)((acc, _) => acc + 1) // sum
+      .to(Sink.foreach(println))
+      .run()
+    // 3
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 10
+    // 6
+    // note that the very last element is never included due to sliding,
+    // but that would not be problem for an infinite stream
+    //#splitAfter
+  }
+
+}
diff --git a/akka-persistence-query/src/main/scala/akka/persistence/query/EventEnvelope.scala b/akka-persistence-query/src/main/scala/akka/persistence/query/EventEnvelope.scala
index 5e2af1f335..067da8585e 100644
--- a/akka-persistence-query/src/main/scala/akka/persistence/query/EventEnvelope.scala
+++ b/akka-persistence-query/src/main/scala/akka/persistence/query/EventEnvelope.scala
@@ -13,6 +13,7 @@ object EventEnvelope extends AbstractFunction4[Offset, String, Long, Any, EventE
   def apply(offset: Offset, persistenceId: String, sequenceNr: Long, event: Any, timestamp: Long): EventEnvelope =
     new EventEnvelope(offset, persistenceId, sequenceNr, event, timestamp)
 
+  @deprecated("for binary compatibility", "2.6.2")
   override def apply(offset: Offset, persistenceId: String, sequenceNr: Long, event: Any): EventEnvelope =
     new EventEnvelope(offset, persistenceId, sequenceNr, event)
 
@@ -37,7 +38,7 @@ final class EventEnvelope(
     extends Product4[Offset, String, Long, Any]
     with Serializable {
 
-  // for binary compatibility
+  @deprecated("for binary compatibility", "2.6.2")
   def this(offset: Offset, persistenceId: String, sequenceNr: Long, event: Any) =
     this(offset, persistenceId, sequenceNr, event, 0L)
 
diff --git a/akka-persistence-query/src/test/scala/akka/persistence/query/journal/leveldb/EventsByTagSpec.scala b/akka-persistence-query/src/test/scala/akka/persistence/query/journal/leveldb/EventsByTagSpec.scala
index b2c5170c2f..c64466e18b 100644
--- a/akka-persistence-query/src/test/scala/akka/persistence/query/journal/leveldb/EventsByTagSpec.scala
+++ b/akka-persistence-query/src/test/scala/akka/persistence/query/journal/leveldb/EventsByTagSpec.scala
@@ -86,18 +86,18 @@ class EventsByTagSpec extends AkkaSpec(EventsByTagSpec.config) with Cleanup with
       greenSrc
         .runWith(TestSink.probe[Any])
         .request(2)
-        .expectNext(EventEnvelope(Sequence(1L), "a", 2L, "a green apple"))
-        .expectNext(EventEnvelope(Sequence(2L), "a", 3L, "a green banana"))
+        .expectNext(EventEnvelope(Sequence(1L), "a", 2L, "a green apple", 0L))
+        .expectNext(EventEnvelope(Sequence(2L), "a", 3L, "a green banana", 0L))
         .expectNoMessage(500.millis)
         .request(2)
-        .expectNext(EventEnvelope(Sequence(3L), "b", 2L, "a green leaf"))
+        .expectNext(EventEnvelope(Sequence(3L), "b", 2L, "a green leaf", 0L))
         .expectComplete()
 
       val blackSrc = queries.currentEventsByTag(tag = "black", offset = Sequence(0L))
       blackSrc
         .runWith(TestSink.probe[Any])
         .request(5)
-        .expectNext(EventEnvelope(Sequence(1L), "b", 1L, "a black car"))
+        .expectNext(EventEnvelope(Sequence(1L), "b", 1L, "a black car", 0L))
         .expectComplete()
     }
 
@@ -108,8 +108,8 @@ class EventsByTagSpec extends AkkaSpec(EventsByTagSpec.config) with Cleanup with
       val probe = greenSrc
         .runWith(TestSink.probe[Any])
         .request(2)
-        .expectNext(EventEnvelope(Sequence(1L), "a", 2L, "a green apple"))
-        .expectNext(EventEnvelope(Sequence(2L), "a", 3L, "a green banana"))
+        .expectNext(EventEnvelope(Sequence(1L), "a", 2L, "a green apple", 0L))
+        .expectNext(EventEnvelope(Sequence(2L), "a", 3L, "a green banana", 0L))
         .expectNoMessage(100.millis)
 
       c ! "a green cucumber"
@@ -118,7 +118,7 @@ class EventsByTagSpec extends AkkaSpec(EventsByTagSpec.config) with Cleanup with
       probe
         .expectNoMessage(100.millis)
         .request(5)
-        .expectNext(EventEnvelope(Sequence(3L), "b", 2L, "a green leaf"))
+        .expectNext(EventEnvelope(Sequence(3L), "b", 2L, "a green leaf", 0L))
         .expectComplete() // green cucumber not seen
     }
 
@@ -128,8 +128,8 @@ class EventsByTagSpec extends AkkaSpec(EventsByTagSpec.config) with Cleanup with
         .runWith(TestSink.probe[Any])
         .request(10)
         // note that banana is not included, since exclusive offset
-        .expectNext(EventEnvelope(Sequence(3L), "b", 2L, "a green leaf"))
-        .expectNext(EventEnvelope(Sequence(4L), "c", 1L, "a green cucumber"))
+        .expectNext(EventEnvelope(Sequence(3L), "b", 2L, "a green leaf", 0L))
+        .expectNext(EventEnvelope(Sequence(4L), "c", 1L, "a green cucumber", 0L))
         .expectComplete()
     }
 
@@ -145,15 +145,15 @@ class EventsByTagSpec extends AkkaSpec(EventsByTagSpec.config) with Cleanup with
       val pinkSrc = queries.currentEventsByTag(tag = "pink")
       val probe = pinkSrc.runWith(TestSink.probe[Any])
 
-      probe.request(1).expectNext(EventEnvelope(Sequence(1L), "z", 1L, "a pink apple"))
+      probe.request(1).expectNext(EventEnvelope(Sequence(1L), "z", 1L, "a pink apple", 0L))
 
       system.log.info("delay before demand")
 
       probe
         .expectNoMessage(200.millis)
         .request(3)
-        .expectNext(EventEnvelope(Sequence(2L), "z", 2L, "a pink banana"))
-        .expectNext(EventEnvelope(Sequence(3L), "z", 3L, "a pink orange"))
+        .expectNext(EventEnvelope(Sequence(2L), "z", 2L, "a pink banana", 0L))
+        .expectNext(EventEnvelope(Sequence(3L), "z", 3L, "a pink orange", 0L))
         .expectComplete()
 
     }
@@ -179,7 +179,7 @@ class EventsByTagSpec extends AkkaSpec(EventsByTagSpec.config) with Cleanup with
 
       try {
 
-        probe.request(2).expectNext(EventEnvelope(Sequence(1L), "b", 1L, "a black car")).expectNoMessage(100.millis)
+        probe.request(2).expectNext(EventEnvelope(Sequence(1L), "b", 1L, "a black car", 0L)).expectNoMessage(100.millis)
 
         d ! "a black dog"
         expectMsg(s"a black dog-done")
@@ -187,10 +187,10 @@ class EventsByTagSpec extends AkkaSpec(EventsByTagSpec.config) with Cleanup with
         expectMsg(s"a black night-done")
 
         probe
-          .expectNext(EventEnvelope(Sequence(2L), "d", 1L, "a black dog"))
+          .expectNext(EventEnvelope(Sequence(2L), "d", 1L, "a black dog", 0L))
           .expectNoMessage(100.millis)
           .request(10)
-          .expectNext(EventEnvelope(Sequence(3L), "d", 2L, "a black night"))
+          .expectNext(EventEnvelope(Sequence(3L), "d", 2L, "a black night", 0L))
       } finally {
         probe.cancel()
       }
@@ -203,8 +203,8 @@ class EventsByTagSpec extends AkkaSpec(EventsByTagSpec.config) with Cleanup with
         probe
           .request(10)
           // note that banana is not included, since exclusive offset
-          .expectNext(EventEnvelope(Sequence(3L), "b", 2L, "a green leaf"))
-          .expectNext(EventEnvelope(Sequence(4L), "c", 1L, "a green cucumber"))
+          .expectNext(EventEnvelope(Sequence(3L), "b", 2L, "a green leaf", 0L))
+          .expectNext(EventEnvelope(Sequence(4L), "c", 1L, "a green cucumber", 0L))
           .expectNoMessage(100.millis)
       } finally {
         probe.cancel()
@@ -222,7 +222,7 @@ class EventsByTagSpec extends AkkaSpec(EventsByTagSpec.config) with Cleanup with
       val probe = yellowSrc
         .runWith(TestSink.probe[Any])
         .request(2)
-        .expectNext(EventEnvelope(Sequence(1L), "y", 1L, "a yellow car"))
+        .expectNext(EventEnvelope(Sequence(1L), "y", 1L, "a yellow car", 0L))
         .expectNoMessage(100.millis)
 
       d ! "a yellow dog"
@@ -231,10 +231,10 @@ class EventsByTagSpec extends AkkaSpec(EventsByTagSpec.config) with Cleanup with
       expectMsg(s"a yellow night-done")
 
       probe
-        .expectNext(EventEnvelope(Sequence(2L), "y", 2L, "a yellow dog"))
+        .expectNext(EventEnvelope(Sequence(2L), "y", 2L, "a yellow dog", 0L))
         .expectNoMessage(100.millis)
         .request(10)
-        .expectNext(EventEnvelope(Sequence(3L), "y", 3L, "a yellow night"))
+        .expectNext(EventEnvelope(Sequence(3L), "y", 3L, "a yellow night", 0L))
 
       probe.cancel()
     }
diff --git a/akka-persistence-typed/src/test/scala/akka/persistence/typed/scaladsl/EventSourcedBehaviorSpec.scala b/akka-persistence-typed/src/test/scala/akka/persistence/typed/scaladsl/EventSourcedBehaviorSpec.scala
index 75ba1ce3c0..263c3d039d 100644
--- a/akka-persistence-typed/src/test/scala/akka/persistence/typed/scaladsl/EventSourcedBehaviorSpec.scala
+++ b/akka-persistence-typed/src/test/scala/akka/persistence/typed/scaladsl/EventSourcedBehaviorSpec.scala
@@ -461,7 +461,7 @@ class EventSourcedBehaviorSpec
       replyProbe.expectMessage(State(1, Vector(0)))
 
       val events = queries.currentEventsByTag("tag1").runWith(Sink.seq).futureValue
-      events shouldEqual List(EventEnvelope(Sequence(1), pid.id, 1, Incremented(1)))
+      events shouldEqual List(EventEnvelope(Sequence(1), pid.id, 1, Incremented(1), 0L))
     }
 
     "handle scheduled message arriving before recovery completed " in {
diff --git a/akka-persistence-typed/src/test/scala/akka/persistence/typed/scaladsl/EventSourcedEventAdapterSpec.scala b/akka-persistence-typed/src/test/scala/akka/persistence/typed/scaladsl/EventSourcedEventAdapterSpec.scala
index 3e7f79e6b8..41391ce6a2 100644
--- a/akka-persistence-typed/src/test/scala/akka/persistence/typed/scaladsl/EventSourcedEventAdapterSpec.scala
+++ b/akka-persistence-typed/src/test/scala/akka/persistence/typed/scaladsl/EventSourcedEventAdapterSpec.scala
@@ -191,7 +191,7 @@ class EventSourcedEventAdapterSpec
       replyProbe.expectMessage(State(1, Vector(0)))
 
       val events = queries.currentEventsByPersistenceId(pid.id).runWith(Sink.seq).futureValue
-      events shouldEqual List(EventEnvelope(Sequence(1), pid.id, 1, GenericWrapper(Incremented(1))))
+      events shouldEqual List(EventEnvelope(Sequence(1), pid.id, 1, GenericWrapper(Incremented(1)), 0L))
 
       val c2 =
         spawn(Behaviors.setup[Command](ctx => counter(ctx, pid).eventAdapter(new GenericWrapperEventAdapter[Event])))
@@ -212,8 +212,8 @@ class EventSourcedEventAdapterSpec
 
       val events = queries.currentEventsByPersistenceId(pid.id).runWith(Sink.seq).futureValue
       events shouldEqual List(
-        EventEnvelope(Sequence(1), pid.id, 1, GenericWrapper(Incremented(1))),
-        EventEnvelope(Sequence(2), pid.id, 2, GenericWrapper(Incremented(1))))
+        EventEnvelope(Sequence(1), pid.id, 1, GenericWrapper(Incremented(1)), 0L),
+        EventEnvelope(Sequence(2), pid.id, 2, GenericWrapper(Incremented(1)), 0L))
 
       val c2 =
         spawn(Behaviors.setup[Command](ctx => counter(ctx, pid).eventAdapter(new GenericWrapperEventAdapter[Event])))
@@ -232,7 +232,7 @@ class EventSourcedEventAdapterSpec
       replyProbe.expectMessage(State(1, Vector(0)))
 
       val events = queries.currentEventsByPersistenceId(pid.id).runWith(Sink.seq).futureValue
-      events shouldEqual List(EventEnvelope(Sequence(1), pid.id, 1, GenericWrapper(Incremented(1))))
+      events shouldEqual List(EventEnvelope(Sequence(1), pid.id, 1, GenericWrapper(Incremented(1)), 0L))
 
       val c2 =
         spawn(Behaviors.setup[Command](ctx => counter(ctx, pid).eventAdapter(new GenericWrapperEventAdapter[Event])))
@@ -240,7 +240,7 @@ class EventSourcedEventAdapterSpec
       replyProbe.expectMessage(State(1, Vector(0)))
 
       val taggedEvents = queries.currentEventsByTag("tag99").runWith(Sink.seq).futureValue
-      taggedEvents shouldEqual List(EventEnvelope(Sequence(1), pid.id, 1, GenericWrapper(Incremented(1))))
+      taggedEvents shouldEqual List(EventEnvelope(Sequence(1), pid.id, 1, GenericWrapper(Incremented(1)), 0L))
     }
   }
 }
diff --git a/akka-persistence/src/test/scala/akka/persistence/journal/inmem/InmemJournalSpec.scala b/akka-persistence/src/test/scala/akka/persistence/journal/inmem/InmemJournalSpec.scala
index 37982c28c2..da6cd3aabe 100644
--- a/akka-persistence/src/test/scala/akka/persistence/journal/inmem/InmemJournalSpec.scala
+++ b/akka-persistence/src/test/scala/akka/persistence/journal/inmem/InmemJournalSpec.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2017-2019 Lightbend Inc. <https://www.lightbend.com>
+ * Copyright (C) 2017-2020 Lightbend Inc. <https://www.lightbend.com>
  */
 
 package akka.persistence.journal.inmem
diff --git a/project/AkkaDisciplinePlugin.scala b/project/AkkaDisciplinePlugin.scala
index 0f1d905732..a55a421ae0 100644
--- a/project/AkkaDisciplinePlugin.scala
+++ b/project/AkkaDisciplinePlugin.scala
@@ -27,8 +27,8 @@ object AkkaDisciplinePlugin extends AutoPlugin with ScalafixSupport {
     val silencerVersion = "1.4.4"
     Seq(
       libraryDependencies ++= Seq(
-          compilerPlugin("com.github.ghik" %% "silencer-plugin" % silencerVersion cross CrossVersion.patch),
-          "com.github.ghik" %% "silencer-lib" % silencerVersion % Provided cross CrossVersion.patch))
+          compilerPlugin(("com.github.ghik" %% "silencer-plugin" % silencerVersion).cross(CrossVersion.patch)),
+          ("com.github.ghik" %% "silencer-lib" % silencerVersion % Provided).cross(CrossVersion.patch)))
   }
 
   lazy val disciplineSettings =
@@ -39,7 +39,6 @@ object AkkaDisciplinePlugin extends AutoPlugin with ScalafixSupport {
           else Seq.empty
         ),
       Test / scalacOptions --= testUndicipline,
-      Compile / console / scalacOptions --= Seq("-deprecation", "-Xfatal-warnings", "-Xlint", "-Ywarn-unused:imports"),
       Compile / scalacOptions ++= (CrossVersion.partialVersion(scalaVersion.value) match {
           case Some((2, 13)) =>
             disciplineScalacOptions -- Set(
@@ -61,7 +60,9 @@ object AkkaDisciplinePlugin extends AutoPlugin with ScalafixSupport {
       // different compiler phases from the regular run), and in particular
       // '-Ywarn-unused:explicits' breaks 'sbt ++2.13.0-M5 akka-actor/doc'
       // https://github.com/akka/akka/issues/26119
-      Compile / doc / scalacOptions --= disciplineScalacOptions.toSeq :+ "-Xfatal-warnings")
+      Compile / doc / scalacOptions --= disciplineScalacOptions.toSeq :+ "-Xfatal-warnings",
+      // having discipline warnings in console is just an annoyance
+      Compile / console / scalacOptions --= disciplineScalacOptions.toSeq)
 
   val testUndicipline = Seq(
     "-Ywarn-dead-code", // ??? used in compile only specs
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 76b35c87ed..4fd6366cfa 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -16,12 +16,12 @@ object Dependencies {
   lazy val java8CompatVersion = settingKey[String]("The version of scala-java8-compat to use.")
 
   val junitVersion = "4.13"
-  val slf4jVersion = "1.7.29"
+  val slf4jVersion = "1.7.30"
   // check agrona version when updating this
-  val aeronVersion = "1.24.0"
+  val aeronVersion = "1.25.0"
   // needs to be inline with the aeron version, check
   // https://github.com/real-logic/aeron/blob/1.x.y/build.gradle
-  val agronaVersion = "1.1.0"
+  val agronaVersion = "1.2.0"
   val nettyVersion = "3.10.6.Final"
   val jacksonVersion = "2.10.2"
   val protobufJavaVersion = "3.10.0"
@@ -37,7 +37,7 @@ object Dependencies {
   val Versions = Seq(
     crossScalaVersions := Seq(scala212Version, scala213Version),
     scalaVersion := System.getProperty("akka.build.scalaVersion", crossScalaVersions.value.head),
-    scalaCheckVersion := sys.props.get("akka.build.scalaCheckVersion").getOrElse("1.14.2"),
+    scalaCheckVersion := sys.props.get("akka.build.scalaCheckVersion").getOrElse("1.14.3"),
     scalaTestVersion := "3.1.0",
     scalaTestPlusVersion := "3.1.0.0",
     java8CompatVersion := {
@@ -128,8 +128,8 @@ object Dependencies {
       val dockerClient = "com.spotify" % "docker-client" % "8.16.0" % "test" // ApacheV2
 
       // metrics, measurements, perf testing
-      val metrics = "io.dropwizard.metrics" % "metrics-core" % "4.1.1" % "test" // ApacheV2
-      val metricsJvm = "io.dropwizard.metrics" % "metrics-jvm" % "4.1.1" % "test" // ApacheV2
+      val metrics = "io.dropwizard.metrics" % "metrics-core" % "4.1.2" % "test" // ApacheV2
+      val metricsJvm = "io.dropwizard.metrics" % "metrics-jvm" % "4.1.2" % "test" // ApacheV2
       val latencyUtils = "org.latencyutils" % "LatencyUtils" % "2.0.3" % "test" // Free BSD
       val hdrHistogram = "org.hdrhistogram" % "HdrHistogram" % "2.1.12" % "test" // CC0
       val metricsAll = Seq(metrics, metricsJvm, latencyUtils, hdrHistogram)
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 08171600e1..8a34ef0317 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -14,7 +14,7 @@ addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.11")
 // sbt-osgi 0.9.5 is available but breaks including jdk9-only classes
 addSbtPlugin("com.typesafe.sbt" % "sbt-osgi" % "0.9.4")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.6.1")
-addSbtPlugin("com.jsuereth" % "sbt-pgp" % "2.0.0")
+addSbtPlugin("com.jsuereth" % "sbt-pgp" % "2.0.1")
 addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.4.2")
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings" % "3.0.0")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.3.7")