Clean up

Author: slissner

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/GraylogExtendedLogFormatStructuredLogFormatter.java

@@ -72,11 +72,6 @@ class GraylogExtendedLogFormatStructuredLogFormatter extends JsonWriterStructure
 	 */
 	private static final String DEFAULT_FULL_MESSAGE_WITH_THROWABLE_FORMAT = "%s%n%n%s";
 
-	/**
-	 * Default value for application name if {@code spring.application.name} is not set.
-	 */
-	private static final String DEFAULT_APPLICATION_NAME = "unknown_service";
-
 	private static final PairExtractor<KeyValuePair> keyValuePairExtractor = PairExtractor
 		.of((pair) -> makeAdditionalFieldName(pair.key), (pair) -> pair.value);