From 48924cb9697ae82cc76f78d8e7f0a95955fb80bd Mon Sep 17 00:00:00 2001
From: Jean Bisutti <jean.bisutti@gmail.com>
Date: Wed, 21 Feb 2024 21:13:42 +0100
Subject: [PATCH] Ability to disable the automatic Logback appender addition

---
 .../LogbackAppenderApplicationListener.java       | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/instrumentation/logging/LogbackAppenderApplicationListener.java b/instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/instrumentation/logging/LogbackAppenderApplicationListener.java
index cc5514f15bf8..ae45e546b286 100644
--- a/instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/instrumentation/logging/LogbackAppenderApplicationListener.java
+++ b/instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/instrumentation/logging/LogbackAppenderApplicationListener.java
@@ -63,12 +63,25 @@ public void onApplicationEvent(ApplicationEvent event) {
       if (existingOpenTelemetryAppender.isPresent()) {
         reInitializeOpenTelemetryAppender(
             existingOpenTelemetryAppender, applicationEnvironmentPreparedEvent);
-      } else {
+      } else if (isLogbackAppenderAddable(applicationEnvironmentPreparedEvent)) {
         addOpenTelemetryAppender(applicationEnvironmentPreparedEvent);
       }
     }
   }
 
+  private static boolean isLogbackAppenderAddable(
+      ApplicationEnvironmentPreparedEvent applicationEnvironmentPreparedEvent) {
+    Boolean otelSdkDisableProperty =
+        evaluateBooleanProperty(applicationEnvironmentPreparedEvent, "otel.sdk.disabled");
+    Boolean logbackInstrumentationEnabledProperty =
+        evaluateBooleanProperty(
+            applicationEnvironmentPreparedEvent, "otel.instrumentation.logback-appender.enabled");
+    return otelSdkDisableProperty == null
+        || !otelSdkDisableProperty.booleanValue()
+        || logbackInstrumentationEnabledProperty == null
+        || logbackInstrumentationEnabledProperty.booleanValue();
+  }
+
   private static void reInitializeOpenTelemetryAppender(
       Optional<OpenTelemetryAppender> existingOpenTelemetryAppender,
       ApplicationEnvironmentPreparedEvent applicationEnvironmentPreparedEvent) {