GH-122 - Default to enable observability features.

Author: odrotbohm

spring-modulith-observability/src/main/java/org/springframework/modulith/observability/autoconfigure/ModuleObservabilityAutoConfiguration.java

@@ -37,7 +37,7 @@
  * @author Oliver Drotbohm
  */
 @Configuration(proxyBeanMethods = false)
-@ConditionalOnProperty(name = "management.tracing.enabled", havingValue = "true")
+@ConditionalOnProperty(name = "management.tracing.enabled", havingValue = "true", matchIfMissing = true)
 class ModuleObservabilityAutoConfiguration {
 
 	@Bean