Add smoke test for Logback MDC instrumentation - Spring Boot app chan…

…ges (#1228)

smoke-tests/springboot/src/main/java/io/opentelemetry/smoketest/springboot/controller/WebController.java

@@ -17,13 +17,18 @@
 package io.opentelemetry.smoketest.springboot.controller;
 
 import io.opentelemetry.extensions.auto.annotations.WithSpan;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController
 public class WebController {
+  private static final Logger LOGGER = LoggerFactory.getLogger(WebController.class);
+
   @RequestMapping("/greeting")
   public String greeting() {
+    LOGGER.info("HTTP request received");
     return withSpan();
   }
 

smoke-tests/springboot/src/main/resources/application.properties

@@ -1 +1,3 @@
-logging.level.root=WARN
+logging.level.root=WARN
+logging.level.io.opentelemetry=INFO
+logging.pattern.console=%-5level [%t] %C{1.}: %msg traceId=%X{traceId}%n