Add prefixes to the context and extra record keys. Needed as some processors have the same keys as the the context. Specifically, the IntrospectionProcessor has "line" and "file" that can overwrite an error context "line" and "file".

src/Monolog/Handler/NewRelicHandler.php

@@ -60,11 +60,11 @@ class NewRelicHandler extends AbstractProcessingHandler
         }
 
         foreach ($record['context'] as $key => $parameter) {
-            newrelic_add_custom_parameter($key, $parameter);
+            newrelic_add_custom_parameter('context_' . $key, $parameter);
         }
 
         foreach ($record['extra'] as $key => $parameter) {
-            newrelic_add_custom_parameter($key, $parameter);
+            newrelic_add_custom_parameter('extra_' . $key, $parameter);
         }
     }
 

tests/Monolog/Handler/NewRelicHandlerTest.php

@@ -45,7 +45,7 @@ class NewRelicHandlerTest extends TestCase
     {
         $handler = new StubNewRelicHandler();
         $handler->handle($this->getRecord(Logger::ERROR, 'log message', array('a' => 'b')));
-        $this->assertEquals(array('a' => 'b'), self::$customParameters);
+        $this->assertEquals(array('context_a' => 'b'), self::$customParameters);
     }
 
     public function testThehandlerCanAddExtraParamsToTheNewRelicTrace()
@@ -56,7 +56,7 @@ class NewRelicHandlerTest extends TestCase
         $handler = new StubNewRelicHandler();
         $handler->handle($record);
 
-        $this->assertEquals(array('c' => 'd'), self::$customParameters);
+        $this->assertEquals(array('extra_c' => 'd'), self::$customParameters);
     }
 
     public function testThehandlerCanAddExtraContextAndParamsToTheNewRelicTrace()
@@ -68,8 +68,8 @@ class NewRelicHandlerTest extends TestCase
         $handler->handle($record);
 
         $expected = array(
-            'a' => 'b',
-            'c' => 'd',
+            'context_a' => 'b',
+            'extra_c' => 'd',
         );
 
         $this->assertEquals($expected, self::$customParameters);