added trace level to log message formatting

fixes #4123

framework/CHANGELOG.md

@@ -62,6 +62,7 @@ Yii Framework 2 Change Log
 - Bug #3989: Fixed yii\log\FileTarget::$rotateByCopy to avoid any rename (cebe)
 - Bug #3996: Traversing `Yii::$app->session` may cause a PHP error (qiangxue)
 - Bug #4020: OCI column detection did not work so gii and other things failed (Sanya1991)
+- Bug #4123: Trace level in logger had no effect in Targets, traces where not logged (cebe)
 - Bug #4127: `CaptchaValidator` clientside error message wasn't formed properly (samdark)
 - Bug #4162: Fixed bug where schema name was not used in ’SHOW CREATE TABLE’ query in `yii\db\mysql\Schema` (stevekr)
 - Bug: Fixed inconsistent return of `\yii\console\Application::runAction()` (samdark)

framework/log/Dispatcher.php

@@ -9,6 +9,7 @@ namespace yii\log;
 
 use Yii;
 use yii\base\Component;
+use yii\base\ErrorHandler;
 
 /**
  * Dispatcher manages a set of [[Target|log targets]].
@@ -183,7 +184,7 @@ class Dispatcher extends Component
                 } catch (\Exception $e) {
                     $target->enabled = false;
                     $targetErrors[] = [
-                        'Unable to send log via '.  get_class($target) .': ' . $e->getMessage(),
+                        'Unable to send log via ' . get_class($target) . ': ' . ErrorHandler::convertExceptionToString($e),
                         Logger::LEVEL_WARNING,
                         __METHOD__,
                         microtime(true),

framework/log/Target.php

@@ -235,9 +235,16 @@ abstract class Target extends Component
         if (!is_string($text)) {
             $text = VarDumper::export($text);
         }
+        $traces = [];
+        if (isset($message[4])) {
+            foreach($message[4] as $trace) {
+                $traces[] = "in {$trace['file']}:{$trace['line']}";
+            }
+        }
 
         $prefix = $this->getMessagePrefix($message);
-        return date('Y-m-d H:i:s', $timestamp) . " {$prefix}[$level][$category] $text";
+        return date('Y-m-d H:i:s', $timestamp) . " {$prefix}[$level][$category] $text"
+            . (empty($traces) ? '' : "\n    " . implode("\n    ", $traces));
     }
 
     /**