[logger] Change default primary log level to 'notice'

Log events issued via error_logger:info_msg or
error_logger:info_report are now forwarded to Logger with level
'notice' instead of 'info'.

Log events issued by gen_* behaviours are also changed from level
'info' to level 'notice'.

Progress reports are still 'info', and can therefore easily be
included/excluded by changing the primary log level. By default, they
are not logged.

6 files changed, 37 insertions, 33 deletions

diff --git a/lib/kernel/src/application_controller.erl b/lib/kernel/src/application_controller.erl
index d5a632ef6f..36479f4be6 100644
--- a/lib/kernel/src/application_controller.erl
+++ b/lib/kernel/src/application_controller.erl
@@ -1920,13 +1920,13 @@ info_started(Name, Node) ->
                 error_logger=>#{tag=>info_report,type=>progress}}).
 
 info_exited(Name, Reason, Type) ->
-    ?LOG_INFO(#{label=>{application_controller,exit},
-                report=>[{application, Name},
-                         {exited, Reason},
-                         {type, Type}]},
-              #{domain=>[otp],
-                report_cb=>fun logger:format_otp_report/1,
-                error_logger=>#{tag=>info_report,type=>std_info}}).
+    ?LOG_NOTICE(#{label=>{application_controller,exit},
+                  report=>[{application, Name},
+                           {exited, Reason},
+                           {type, Type}]},
+                #{domain=>[otp],
+                  report_cb=>fun logger:format_otp_report/1,
+                  error_logger=>#{tag=>info_report,type=>std_info}}).
 
 %%-----------------------------------------------------------------
 %% Reply to all processes waiting this application to be started.  
diff --git a/lib/kernel/src/error_logger.erl b/lib/kernel/src/error_logger.erl
index ef930317b1..a0bf87796b 100644
--- a/lib/kernel/src/error_logger.erl
+++ b/lib/kernel/src/error_logger.erl
@@ -317,7 +317,7 @@ info_report(Report) ->
       Report :: report().
 
 info_report(Type, Report) ->
-    logger:log(info,
+    logger:log(notice,
                #{label=>{?MODULE,info_report},
                  report=>Report},
                meta(info_report,Type)).
@@ -338,7 +338,7 @@ info_msg(Format) ->
       Data :: list().
 
 info_msg(Format, Args) ->
-    logger:log(info,
+    logger:log(notice,
                #{label=>{?MODULE,info_msg},
                  format=>Format,
                  args=>Args},
@@ -358,7 +358,7 @@ error_info(Error) ->
             false -> {"~p",[Error]}
         end,
     MyMeta = #{tag=>info,type=>Error},
-    logger:log(info, Format, Args, #{?MODULE=>MyMeta,domain=>[Error]}).
+    logger:log(notice, Format, Args, #{?MODULE=>MyMeta,domain=>[Error]}).
 
 %%-----------------------------------------------------------------
 %% Create metadata
diff --git a/lib/kernel/src/kernel.app.src b/lib/kernel/src/kernel.app.src
index d873178f55..390f1fa42a 100644
--- a/lib/kernel/src/kernel.app.src
+++ b/lib/kernel/src/kernel.app.src
@@ -140,9 +140,8 @@
                 inet_db,
                 pg2]},
   {applications, []},
-  {env, [{logger_level, info},
-         {logger_sasl_compatible, false},
-         {logger_progress_reports, stop}
+  {env, [{logger_level, notice},
+         {logger_sasl_compatible, false}
         ]},
   {mod, {kernel, []}},
   {runtime_dependencies, ["erts-10.0", "stdlib-3.5", "sasl-3.0"]}
diff --git a/lib/kernel/src/logger.erl b/lib/kernel/src/logger.erl
index f6dc8ea397..e0832bf31c 100644
--- a/lib/kernel/src/logger.erl
+++ b/lib/kernel/src/logger.erl
@@ -710,15 +710,7 @@ get_default_handler_filters() ->
         true ->
             ?DEFAULT_HANDLER_FILTERS([otp]);
         false ->
-            Extra =
-                case application:get_env(kernel, logger_progress_reports, stop) of
-                    log ->
-                        [];
-                    stop ->
-                        [{stop_progress,
-                          {fun logger_filters:progress/2,stop}}]
-                end,
-            Extra ++ ?DEFAULT_HANDLER_FILTERS([otp,sasl])
+            ?DEFAULT_HANDLER_FILTERS([otp,sasl])
     end.
 
 get_logger_env() ->
@@ -726,17 +718,14 @@ get_logger_env() ->
 
 %%%-----------------------------------------------------------------
 %%% Internal
-do_log(Level,Msg,Meta) ->
-    do_log_1(Level,Msg,Meta).
-
-do_log_1(Level,Msg,#{mfa:={Module,_,_}}=Meta) ->
+do_log(Level,Msg,#{mfa:={Module,_,_}}=Meta) ->
     case logger_config:allow(?LOGGER_TABLE,Level,Module) of
         true ->
             log_allowed(#{},Level,Msg,Meta);
         false ->
             ok
     end;
-do_log_1(Level,Msg,Meta) ->
+do_log(Level,Msg,Meta) ->
     case logger_config:allow(?LOGGER_TABLE,Level) of
         true ->
             log_allowed(#{},Level,Msg,Meta);
diff --git a/lib/kernel/src/logger_formatter.erl b/lib/kernel/src/logger_formatter.erl
index 6eeac994ea..4ebd88ac2d 100644
--- a/lib/kernel/src/logger_formatter.erl
+++ b/lib/kernel/src/logger_formatter.erl
@@ -234,7 +234,7 @@ format_mfa(MFA) ->
 maybe_add_legacy_header(Level,
                         #{time:=Timestamp}=Meta,
                         #{legacy_header:=true}=Config) ->
-    #{title:=Title}=MyMeta = add_legacy_title(Level,maps:get(?MODULE,Meta,#{})),
+    #{title:=Title}=MyMeta = add_legacy_title(Level,Meta,Config),
     {{Y,Mo,D},{H,Mi,S},Micro,UtcStr} =
         timestamp_to_datetimemicro(Timestamp,Config),
     Header =
@@ -244,11 +244,23 @@ maybe_add_legacy_header(Level,
 maybe_add_legacy_header(_,Meta,_) ->
     Meta.
 
-add_legacy_title(_Level,#{title:=_}=MyMeta) ->
+add_legacy_title(_Level,#{?MODULE:=#{title:=_}=MyMeta},_) ->
     MyMeta;
-add_legacy_title(Level,MyMeta) ->
-    Title = string:uppercase(atom_to_list(Level)) ++ " REPORT",
-    MyMeta#{title=>Title}.
+add_legacy_title(Level,Meta,Config) ->
+    case maps:get(?MODULE,Meta,#{}) of
+        #{title:=_}=MyMeta ->
+            MyMeta;
+        MyMeta ->
+            TitleLevel =
+                case (Level=:=notice andalso maps:find(error_logger,Meta)) of
+                    {ok,_} ->
+                        maps:get(error_logger_notice_header,Config);
+                    _ ->
+                        Level
+                end,
+            Title = string:uppercase(atom_to_list(TitleLevel)) ++ " REPORT",
+            MyMeta#{title=>Title}
+    end.
 
 month(1) -> "Jan";
 month(2) -> "Feb";
@@ -268,6 +280,7 @@ month(12) -> "Dec".
 add_default_config(Config0) ->
     Default =
         #{legacy_header=>false,
+          error_logger_notice_header=>info,
           single_line=>true,
           chars_limit=>unlimited,
           time_designator=>$T},
@@ -352,6 +365,9 @@ do_check_config([{single_line,SL}|Config]) when is_boolean(SL) ->
     do_check_config(Config);
 do_check_config([{legacy_header,LH}|Config]) when is_boolean(LH) ->
     do_check_config(Config);
+do_check_config([{error_logger_notice_header,ELNH}|Config]) when ELNH == info;
+                                                                 ELNH == notice ->
+    do_check_config(Config);
 do_check_config([{report_cb,RCB}|Config]) when is_function(RCB,1) ->
     do_check_config(Config);
 do_check_config([{template,T}|Config]) ->
diff --git a/lib/kernel/src/logger_server.erl b/lib/kernel/src/logger_server.erl
index 6d4ab0925d..5da8f71420 100644
--- a/lib/kernel/src/logger_server.erl
+++ b/lib/kernel/src/logger_server.erl
@@ -357,7 +357,7 @@ do_set_config(Tid,Id,Config) ->
     ok.
 
 default_config(primary) ->
-    #{level=>info,
+    #{level=>notice,
       filters=>[],
       filter_default=>log};
 default_config(Id) ->