chore: regenerate observability client (googleapis#30325)

Generated in GitHub action: https://togithub.com/googleapis/googleapis/google-api-java-client-services/actions/workflows/codegen.yaml

Author: yoshi-code-bot

clients/google-api-services-observability/v1/2.0.0/README.md

@@ -1,6 +1,6 @@
 # Observability API Client Library for Java
 
-
+Provides functionality for configuring the observability scope, which controls the log, metric, and trace data that you can view.
 
 This page contains information about getting started with the Observability API
 using the Google API Client Library for Java. In addition, you may be interested
@@ -22,7 +22,7 @@ Add the following lines to your `pom.xml` file:
     <dependency>
       <groupId>com.google.apis</groupId>
       <artifactId>google-api-services-observability</artifactId>
-      <version>v1-rev20251204-2.0.0</version>
+      <version>v1-rev20251211-2.0.0</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  implementation 'com.google.apis:google-api-services-observability:v1-rev20251204-2.0.0'
+  implementation 'com.google.apis:google-api-services-observability:v1-rev20251211-2.0.0'
 }
 ```