logger: Rework configuration of logger

Most logger configuration that was possible through
kernel application variables have been moved into a
common 'logger' application environment in kernel.

Now all the configuration possible through the logger
API can be done as sys config.

The handler started by kernel has been renamed to 'default'
instead of logger_std_h.

There is a new logger:setup_handlers/1 function that given an
application name can be used to setup handlers in other applications.

1 files changed, 5 insertions, 6 deletions

diff --git a/lib/kernel/doc/src/logger_std_h.xml b/lib/kernel/doc/src/logger_std_h.xml
index fe9b9ca5a9..bf23d874c8 100644
--- a/lib/kernel/doc/src/logger_std_h.xml
+++ b/lib/kernel/doc/src/logger_std_h.xml
@@ -40,7 +40,7 @@
       application. Multiple instances of this handler can be added to
       logger, and each instance will print logs to <c>standard_io</c>,
       <c>standard_error</c> or to file. The default instance that starts
-      with kernel is named <c>logger_std_h</c> - which is the name to be used
+      with kernel is named <c>default</c> - which is the name to be used
       for reconfiguration.</p>
     <p>The handler has an overload protection mechanism that will keep the handler
       process and the kernel application alive during a high load of log 
@@ -57,7 +57,7 @@
        are stored in a sub map with the key <c>logger_std_h</c>. The following
        keys and values may be specified:</p>
     <taglist>
-      <tag><c>type</c></tag>
+      <tag><marker id="type"/><c>type</c></tag>
       <item>
 	<p>This will have the value <c>standard_io</c>, <c>standard_error</c>,
 	<c>{file,LogFileName}</c>, or <c>{file,LogFileName,LogFileOpts}</c>,
@@ -105,11 +105,10 @@ logger:add_handler(my_standard_h, logger_std_h,
     </code>
     <p>In order to configure the default handler (that starts initially with
     the kernel application) to log to file instead of <c>standard_io</c>,
-    use the kernel configuration parameter
-    <seealso marker="kernel_app#configuration"><c>logger_dest</c></seealso> with
-    value <c>{file,FileName}</c>. Example:</p>
+    change the Kernel default logger to use a file. Example:</p>
     <code type="none">
-erl -kernel logger_dest '{file,"./erl.log"}'
+erl -kernel logger '[{handler,default,logger_std_h,
+                      #{ logger_std_h => #{ type => {file,"./log.log"}}}}]'
     </code>
     <p>An example of how to replace the standard handler with a disk_log handler
     at startup can be found in the manual of