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diff --git a/kamon-akka/src/main/scala/kamon/akka/EntityRecorders.scala b/kamon-akka/src/main/scala/kamon/akka/EntityRecorders.scala
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+/*
+ * =========================================================================================
+ * Copyright © 2013-2014 the kamon project <http://kamon.io/>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific language governing permissions
+ * and limitations under the License.
+ * =========================================================================================
+ */
+package kamon.akka
+
+import kamon.metric._
+import kamon.metric.instrument.{ Time, InstrumentFactory }
+
+/**
+ *
+ *  Entity recorder for Akka Actors. The metrics being tracked are:
+ *
+ *    - time-in-mailbox: Time spent from the instant when a message is enqueued in a actor's mailbox to the instant when
+ *      that message is dequeued for processing.
+ *    - processing-time: Time taken for the actor to process the receive function.
+ *    - mailbox-size: Size of the actor's mailbox.
+ *    - errors: Number or errors seen by the actor's supervision mechanism.
+ */
+class ActorMetrics(instrumentFactory: InstrumentFactory) extends GenericEntityRecorder(instrumentFactory) {
+  val timeInMailbox = histogram("time-in-mailbox", Time.Nanoseconds)
+  val processingTime = histogram("processing-time", Time.Nanoseconds)
+  val mailboxSize = minMaxCounter("mailbox-size")
+  val errors = counter("errors")
+}
+
+object ActorMetrics extends EntityRecorderFactoryCompanion[ActorMetrics]("akka-actor", new ActorMetrics(_))
+
+/**
+ *
+ *  Entity recorder for Akka Routers. The metrics being tracked are:
+ *
+ *    - routing-time: Time taken for the router to process the routing logic.
+ *    - time-in-mailbox: Time spent from the instant when a message is enqueued in a actor's mailbox to the instant when
+ *      that message is dequeued for processing.
+ *    - processing-time: Time taken for the actor to process the receive function.
+ *    - errors: Number or errors seen by the actor's supervision mechanism.
+ */
+class RouterMetrics(instrumentFactory: InstrumentFactory) extends GenericEntityRecorder(instrumentFactory) {
+  val routingTime = histogram("routing-time", Time.Nanoseconds)
+  val timeInMailbox = histogram("time-in-mailbox", Time.Nanoseconds)
+  val processingTime = histogram("processing-time", Time.Nanoseconds)
+  val errors = counter("errors")
+}
+
+object RouterMetrics extends EntityRecorderFactoryCompanion[RouterMetrics]("akka-router", new RouterMetrics(_))
+
+/**
+ *
+ *  Entity recorder for Actor Groups. The metrics being tracked are:
+ *
+ *    - time-in-mailbox: Time spent from the instant when a message is enqueued in a actor's mailbox to the instant when
+ *      that message is dequeued for processing.
+ *    - processing-time: Time taken for the actor to process the receive function.
+ *    - errors: Number or errors seen by the actor's supervision mechanism.
+ */
+class ActorGroupMetrics(instrumentFactory: InstrumentFactory) extends GenericEntityRecorder(instrumentFactory) {
+  val timeInMailbox = histogram("time-in-mailbox", Time.Nanoseconds)
+  val processingTime = histogram("processing-time", Time.Nanoseconds)
+  val errors = counter("errors")
+}
+
+object ActorGroupMetrics extends EntityRecorderFactoryCompanion[ActorGroupMetrics]("akka-actor-group", new ActorGroupMetrics(_))