+slf #16630 Add the actor system name to the Slf4jLogger context

akka-docs/rst/java/logging.rst

@@ -305,7 +305,7 @@ the first case and ``LoggerFactory.getLogger(String s)`` in the second).
 
   final LoggingAdapter log = Logging.getLogger(system.eventStream(), "my.string");
 
-Logging Thread and Akka Source in MDC
+Logging Thread, Akka Source and Actor System in MDC
 -------------------------------------
 
 Since the logging is done asynchronously the thread in which the logging was performed is captured in
@@ -335,6 +335,15 @@ information is available in the MDC with attribute name ``akkaSource``::
     </encoder>
   </appender>
 
+Finally, the actor system in which the logging was performed
+is available in the MDC with attribute name ``sourceActorSystem``::
+
+  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+    <encoder>
+      <pattern>%date{ISO8601} %-5level %logger{36} %X{sourceActorSystem} - %msg%n</pattern>
+    </encoder>
+  </appender>
+
 For more details on what this attribute contains—also for non-actors—please see
 `How to Log`_.
 

akka-docs/rst/scala/logging.rst

@@ -341,7 +341,7 @@ the first case and ``LoggerFactory.getLogger(s: String)`` in the second).
 
   val log = Logging(system.eventStream, "my.nice.string")
 
-Logging Thread and Akka Source in MDC
+Logging Thread, Akka Source and Actor System in MDC
 -------------------------------------
 
 Since the logging is done asynchronously the thread in which the logging was performed is captured in
@@ -371,6 +371,15 @@ information is available in the MDC with attribute name ``akkaSource``::
     </encoder>
   </appender>
 
+Finally, the actor system in which the logging was performed
+is available in the MDC with attribute name ``sourceActorSystem``::
+
+  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+    <encoder>
+      <pattern>%date{ISO8601} %-5level %logger{36} %X{sourceActorSystem} - %msg%n</pattern>
+    </encoder>
+  </appender>
+
 For more details on what this attribute contains—also for non-actors—please see
 `How to Log`_.
 

akka-slf4j/src/main/scala/akka/event/slf4j/Slf4jLogger.scala

@@ -56,6 +56,7 @@ object Logger {
 class Slf4jLogger extends Actor with SLF4JLogging {
 
   val mdcThreadAttributeName = "sourceThread"
+  val mdcActorSystemAttributeName = "sourceActorSystem"
   val mdcAkkaSourceAttributeName = "akkaSource"
   val mdcAkkaTimestamp = "akkaTimestamp"
 
@@ -88,11 +89,13 @@ class Slf4jLogger extends Actor with SLF4JLogging {
     MDC.put(mdcAkkaSourceAttributeName, logSource)
     MDC.put(mdcThreadAttributeName, logEvent.thread.getName)
     MDC.put(mdcAkkaTimestamp, formatTimestamp(logEvent.timestamp))
+    MDC.put(mdcActorSystemAttributeName, actorSystemName)
     logEvent.mdc foreach { case (k, v) ⇒ MDC.put(k, String.valueOf(v)) }
     try logStatement finally {
       MDC.remove(mdcAkkaSourceAttributeName)
       MDC.remove(mdcThreadAttributeName)
       MDC.remove(mdcAkkaTimestamp)
+      MDC.remove(mdcActorSystemAttributeName)
       logEvent.mdc.keys.foreach(k ⇒ MDC.remove(k))
     }
   }
@@ -104,6 +107,8 @@ class Slf4jLogger extends Actor with SLF4JLogging {
    */
   protected def formatTimestamp(timestamp: Long): String =
     Helpers.currentTimeMillisToUTCString(timestamp)
+
+  private val actorSystemName = context.system.name
 }
 
 /**

akka-slf4j/src/test/resources/logback-test.xml

@@ -7,7 +7,7 @@
   </appender>
   <appender name="TEST" class="akka.event.slf4j.Slf4jLoggerSpec$TestAppender">
     <encoder>
-      <pattern>%date{ISO8601} level=[%level] logger=[%logger] akkaSource=[%X{akkaSource}] sourceThread=[%X{sourceThread}] mdc=[ticket-#%X{ticketNumber}: %X{ticketDesc}] - msg=[%msg]%n----%n</pattern>
+      <pattern>%date{ISO8601} level=[%level] logger=[%logger] akkaSource=[%X{akkaSource}] sourceActorSystem=[%X{sourceActorSystem}] sourceThread=[%X{sourceThread}] mdc=[ticket-#%X{ticketNumber}: %X{ticketDesc}] - msg=[%msg]%n----%n</pattern>
     </encoder>
   </appender>
   <logger name="akka.event.slf4j.Slf4jLoggingFilterSpec$DebugLevelProducer"

akka-slf4j/src/test/scala/akka/event/slf4j/Slf4jLoggerSpec.scala

@@ -156,6 +156,14 @@ class Slf4jLoggerSpec extends AkkaSpec(Slf4jLoggerSpec.config) with BeforeAndAft
       s should include("akkaSource=[Slf4jLoggerSpec$MyLogSource]")
       s should include("logger=[akka.event.slf4j.Slf4jLoggerSpec$MyLogSource]")
     }
+
+    "include actorSystem name in sourceActorSystem" in {
+      val log = Logging(system.eventStream, classOf[MyLogSource])
+      log.info("test")
+      awaitCond(outputString.contains("----"), 5 seconds)
+      val s = outputString
+      s should include("sourceActorSystem=[Slf4jLoggerSpec]")
+    }
   }
 
 }