diff --git a/core/config.class.inc.php b/core/config.class.inc.php
index b39f505470..163eedf492 100644
--- a/core/config.class.inc.php
+++ b/core/config.class.inc.php
@@ -99,6 +99,14 @@ class Config
 	 * @since 2.7.0 export_pdf_font param
 	 */
 	protected $m_aSettings = array(
+		'min_log_level' => array(
+			'type' => 'array',
+			'description' => 'min log level',
+			'default' => 'Ok',
+			'value' => 'Ok',
+			'source_of_value' => '',
+			'show_in_conf_sample' => false,
+		),
 		'app_env_label' => array(
 			'type' => 'string',
 			'description' => 'Label displayed to describe the current application environment, defaults to the environment name (e.g. "production")',
diff --git a/core/log.class.inc.php b/core/log.class.inc.php
index b57c6ec7b6..2a36d6170e 100644
--- a/core/log.class.inc.php
+++ b/core/log.class.inc.php
@@ -199,27 +199,42 @@ class FileLog
 		}
 	}
 
-	public function Error($sText)
+	public function Error($sText, $sChannel = '', $aContext = array())
 	{
-		$this->Write('Error | '.$sText);
+		$sLevel   = str_pad(__FUNCTION__, 7).' | ';
+		$sChannel = empty($sChannel) ? '' : " | $sChannel";
+		$this->Write("{$sLevel}{$sText}{$sChannel}", $aContext);
 	}
 
-	public function Warning($sText)
+	public function Warning($sText, $sChannel = '', $aContext = array())
 	{
-		$this->Write('Warning | '.$sText);
+		$sLevel   = str_pad(__FUNCTION__, 7).' | ';
+		$sChannel = empty($sChannel) ? '' : " | $sChannel";
+		$this->Write("{$sLevel}{$sText}{$sChannel}", $aContext);
 	}
 
-	public function Info($sText)
+	public function Info($sText, $sChannel = '', $aContext = array())
 	{
-		$this->Write('Info | '.$sText);
+		$sLevel   = str_pad(__FUNCTION__, 7).' | ';
+		$sChannel = empty($sChannel) ? '' : " | $sChannel";
+		$this->Write("{$sLevel}{$sText}{$sChannel}", $aContext);
 	}
 
-	public function Ok($sText)
+	public function Ok($sText, $sChannel = '', $aContext = array())
 	{
-		$this->Write('Ok | '.$sText);
+		$sLevel   = str_pad(__FUNCTION__, 7).' | ';
+		$sChannel = empty($sChannel) ? '' : " | $sChannel";
+		$this->Write("{$sLevel}{$sText}{$sChannel}", $aContext);
 	}
 
-	protected function Write($sText)
+	public function Debug($sText, $sChannel = '', $aContext = array())
+	{
+		$sLevel   = str_pad(__FUNCTION__, 7).' | ';
+		$sChannel = empty($sChannel) ? '' : " | $sChannel";
+		$this->Write("{$sLevel}{$sText}{$sChannel}", $aContext);
+	}
+
+	protected function Write($sText, $aContext = array())
 	{
 		$sLogFilePath = $this->oFileNameBuilder->GetLogFilePath();
 
@@ -233,6 +248,15 @@ class FileLog
 		{
 			flock($hLogFile, LOCK_EX);
 			$sDate = date('Y-m-d H:i:s');
+			if (empty($aContext))
+			{
+				fwrite($hLogFile, "$sDate | $sText\n");
+			}
+			else
+			{
+				$sContext = var_export($aContext, true);
+				fwrite($hLogFile, "$sDate | $sText\n$sContext\n");
+			}
 			fwrite($hLogFile, "$sDate | $sText\n");
 			fflush($hLogFile);
 			flock($hLogFile, LOCK_UN);
@@ -243,53 +267,147 @@ class FileLog
 
 abstract class LogAPI
 {
+	const CHANNEL_DEFAULT   = '';
+
+	const LEVEL_DEBUG       = 'Debug';
+	const LEVEL_OK          = 'Ok';
+	const LEVEL_INFO        = 'Info';
+	const LEVEL_WARNING     = 'Warning';
+	const LEVEL_ERROR       = 'Error';
+//	const LEVEL_CRITICAL    = 'Critical';
+//	const LEVEL_ALERT       = 'Alert';
+//	const LEVEL_EMERGENCY   = 'Emergency';
+
+	protected static $aLevelsPriority = array(
+		self::LEVEL_DEBUG   => 100,
+		self::LEVEL_OK      => 150,
+		self::LEVEL_INFO    => 200,
+		self::LEVEL_WARNING => 300,
+		self::LEVEL_ERROR   => 400,
+	);
+
 	public static function Enable($sTargetFile)
 	{
 		// m_oFileLog is not defined as a class attribute so that each impl will have its own
 		static::$m_oFileLog = new FileLog($sTargetFile);
 	}
 
-	public static function Error($sText)
+	public static function Error($sMessage, $sChannel = null, $aContext = array())
 	{
-		if (static::$m_oFileLog)
-		{
-			static::$m_oFileLog->Error($sText);
-		}
+		static::Log(self::LEVEL_ERROR, $sMessage, $sChannel, $aContext);
 	}
-	public static function Warning($sText)
+
+	public static function Warning($sMessage, $sChannel = null, $aContext = array())
 	{
-		if (static::$m_oFileLog)
-		{
-			static::$m_oFileLog->Warning($sText);
-		}
+		static::Log(self::LEVEL_WARNING, $sMessage, $sChannel, $aContext);
 	}
-	public static function Info($sText)
+
+	public static function Info($sMessage, $sChannel = null, $aContext = array())
 	{
-		if (static::$m_oFileLog)
-		{
-			static::$m_oFileLog->Info($sText);
-		}
+		static::Log(self::LEVEL_INFO, $sMessage, $sChannel, $aContext);
 	}
-	public static function Ok($sText)
+
+	public static function Ok($sMessage, $sChannel = null, $aContext = array())
 	{
-		if (static::$m_oFileLog)
-		{
-			static::$m_oFileLog->Ok($sText);
-		}
+		static::Log(self::LEVEL_OK, $sMessage, $sChannel, $aContext);
 	}
+
+	public static function Debug($sMessage, $sChannel = null, $aContext = array())
+	{
+		static::Log(self::LEVEL_DEBUG, $sMessage, $sChannel, $aContext);
+	}
+
+	public static function Log($sLevel, $sMessage, $sChannel = null, $aContext = array())
+	{
+		if (! static::$m_oFileLog)
+		{
+			return;
+		}
+
+		if (! isset(self::$aLevelsPriority[$sLevel]))
+		{
+			IssueLog::Error("invalid log level '{$sLevel}'");
+			return;
+		}
+
+		if (is_null($sChannel))
+		{
+			$sChannel = static::CHANNEL_DEFAULT;
+		}
+
+		$sMinLogLevel = self::GetMinLogLevel($sChannel);
+
+		if ($sMinLogLevel === false || $sMinLogLevel === 'false')
+		{
+			return;
+		}
+		if (is_string($sMinLogLevel))
+		{
+			if (! isset(self::$aLevelsPriority[$sMinLogLevel]))
+			{
+				throw new Exception("invalid configuration for log_level '{$sMinLogLevel}' is not within the list: ".implode(',', array_keys(self::$aLevelsPriority)));
+			}
+			elseif (self::$aLevelsPriority[$sLevel] < self::$aLevelsPriority[$sMinLogLevel])
+			{
+				//priority too low regarding the conf, do not log this
+				return;
+			}
+		}
+
+		static::$m_oFileLog->$sLevel($sMessage, $sChannel, $aContext);
+	}
+
+	/**
+	 * @param $sChannel
+	 *
+	 * @return mixed|null
+	 */
+	private static function GetMinLogLevel($sChannel)
+	{
+		$oConfig = \MetaModel::GetConfig();
+		if (! $oConfig instanceof Config)
+		{
+			return self::LEVEL_OK;
+		}
+
+		$sMinLogLevel = $oConfig->Get('min_log_level');
+		if (! is_array($sMinLogLevel))
+		{
+			return $sMinLogLevel;
+		}
+
+		if (isset($sMinLogLevel[$sChannel]))
+		{
+			return $sMinLogLevel[$sChannel];
+		}
+
+		if (isset($sMinLogLevel[static::CHANNEL_DEFAULT]))
+		{
+			return $sMinLogLevel[$sChannel];
+		}
+
+		return self::LEVEL_OK;
+	}
+
 }
 
 class SetupLog extends LogAPI
 {
+	const CHANNEL_DEFAULT = 'SetupLog';
+
 	protected static $m_oFileLog = null;
 }
 
 class IssueLog extends LogAPI
 {
+	const CHANNEL_DEFAULT = 'IssueLog';
+
 	protected static $m_oFileLog = null;
 }
 
 class ToolsLog extends LogAPI
 {
+	const CHANNEL_DEFAULT = 'ToolsLog';
+
 	protected static $m_oFileLog = null;
 }