[Kaizen] improve logging configuration (#977)

Author: jvdp

src/main/resources/conf/base.conf

@@ -629,8 +629,11 @@ mantis {
 
 akka {
   loggers = ["akka.event.slf4j.Slf4jLogger"]
-  # Not using ${logging.logs-level} because it might be set to TRACE, which our version of Akka doesn't have.
+  
+  # defaults to INFO to prevent any performance impact
   loglevel = "INFO"
+  loglevel = ${?AKKA_LOGLEVEL}
+  
   logging-filter = "akka.event.slf4j.Slf4jLoggingFilter"
   logger-startup-timeout = 30s
   log-dead-letters-during-shutdown = off
@@ -688,5 +691,6 @@ logging {
   logs-file = "mantis"
 
   # Logs level
+  # NB. be aware you might want to adjust akka.loglevel as well if set to DEBUG
   logs-level = "INFO"
 }

src/main/resources/logback.xml

@@ -1,6 +1,6 @@
 <configuration>
 
-    <property name="stdoutEncoderPattern" value="%d [%logger{36}] - %msg%n" />
+    <property name="stdoutEncoderPattern" value="%d %-5level [%logger{36}] - %msg%n" />
     <property name="fileEncoderPattern" value="%d [%thread] %-5level %logger{36} %X{akkaSource} - %msg%n" />
 
     <!--read properties from application.conf-->
@@ -57,8 +57,10 @@
         <appender-ref ref="METRICS" />
     </root>
 
+    <!-- NB. be aware you might want to adjust akka.loglevel if you set any level to DEBUG -->
     <logger name="io.netty" level="WARN"/>
     <logger name="io.iohk.scalanet" level="INFO" />
+    <logger name="io.iohk.scalanet.discovery.ethereum.v4.DiscoveryService" level="WARN" />
     <logger name="io.iohk.ethereum.blockchain.sync.SyncController" level="INFO" />
     <logger name="io.iohk.ethereum.network.PeerActor" level="${LOGSLEVEL}" />
     <logger name="io.iohk.ethereum.network.rlpx.RLPxConnectionHandler" level="${LOGSLEVEL}" />

src/main/scala/io/iohk/ethereum/Mantis.scala

@@ -2,9 +2,12 @@ package io.iohk.ethereum
 
 import io.iohk.ethereum.nodebuilder.{StdNode, TestNode}
 import io.iohk.ethereum.utils.{Config, Logger}
+import java.util.logging.LogManager
 
 object Mantis extends Logger {
   def main(args: Array[String]): Unit = {
+    LogManager.getLogManager().reset(); // disable java.util.logging, ie. in legacy parts of jupnp
+
     val node =
       if (Config.testmode) {
         log.info("Starting Mantis in test mode")