Change log level from DEBUG to INFO for ObservationHandlers

The features are disabled by default and users need to explicitly
enable them. Probably it makes more sense to log on INFO level so that
users don't need to change the log level if they use the default
behavior of Spring Boot.

See spring-projectsgh-3003
See spring-projectsgh-3127

Author: jonatan-ivanov

spring-ai-client-chat/src/main/java/org/springframework/ai/chat/client/observation/ChatClientPromptContentObservationHandler.java

@@ -40,7 +40,7 @@ public class ChatClientPromptContentObservationHandler implements ObservationHan
 
 	@Override
 	public void onStop(ChatClientObservationContext context) {
-		logger.debug("Chat Client Prompt Content:\n{}", ObservabilityHelper.concatenateEntries(processPrompt(context)));
+		logger.info("Chat Client Prompt Content:\n{}", ObservabilityHelper.concatenateEntries(processPrompt(context)));
 	}
 
 	private Map<String, Object> processPrompt(ChatClientObservationContext context) {

spring-ai-client-chat/src/test/java/org/springframework/ai/chat/client/observation/ChatClientPromptContentObservationHandlerTests.java

@@ -63,7 +63,7 @@ void whenEmptyPromptThenOutputNothing(CapturedOutput output) {
 			.build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Chat Client Prompt Content:
+				INFO  o.s.a.c.c.o.ChatClientPromptContentObservationHandler -- Chat Client Prompt Content:
 				[]
 				""");
 	}
@@ -75,7 +75,7 @@ void whenPromptWithTextThenOutputIt(CapturedOutput output) {
 			.build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Chat Client Prompt Content:
+				INFO  o.s.a.c.c.o.ChatClientPromptContentObservationHandler -- Chat Client Prompt Content:
 				["user":"supercalifragilisticexpialidocious"]
 				""");
 	}
@@ -90,7 +90,7 @@ void whenPromptWithMessagesThenOutputIt(CapturedOutput output) {
 			.build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Chat Client Prompt Content:
+				INFO  o.s.a.c.c.o.ChatClientPromptContentObservationHandler -- Chat Client Prompt Content:
 				["system":"you're a chimney sweep", "user":"supercalifragilisticexpialidocious"]
 				""");
 	}

spring-ai-model/src/main/java/org/springframework/ai/chat/observation/ChatModelCompletionObservationHandler.java

@@ -40,7 +40,7 @@ public class ChatModelCompletionObservationHandler implements ObservationHandler
 
 	@Override
 	public void onStop(ChatModelObservationContext context) {
-		logger.debug("Chat Model Completion:\n{}", ObservabilityHelper.concatenateStrings(completion(context)));
+		logger.info("Chat Model Completion:\n{}", ObservabilityHelper.concatenateStrings(completion(context)));
 	}
 
 	private List<String> completion(ChatModelObservationContext context) {

spring-ai-model/src/main/java/org/springframework/ai/chat/observation/ChatModelPromptContentObservationHandler.java

@@ -40,7 +40,7 @@ public class ChatModelPromptContentObservationHandler implements ObservationHand
 
 	@Override
 	public void onStop(ChatModelObservationContext context) {
-		logger.debug("Chat Model Prompt Content:\n{}", ObservabilityHelper.concatenateStrings(prompt(context)));
+		logger.info("Chat Model Prompt Content:\n{}", ObservabilityHelper.concatenateStrings(prompt(context)));
 	}
 
 	private List<String> prompt(ChatModelObservationContext context) {

spring-ai-model/src/main/java/org/springframework/ai/image/observation/ImageModelPromptContentObservationHandler.java

@@ -44,7 +44,7 @@ public void onStop(ImageModelObservationContext context) {
 				.getInstructions()
 				.forEach(message -> promptMessagesJoiner.add("\"" + message.getText() + "\""));
 
-			logger.debug("Image Model Prompt Content:\n{}", promptMessagesJoiner);
+			logger.info("Image Model Prompt Content:\n{}", promptMessagesJoiner);
 		}
 	}
 

spring-ai-model/src/test/java/org/springframework/ai/chat/observation/ChatModelCompletionObservationHandlerTests.java

@@ -66,7 +66,7 @@ void whenEmptyResponseThenOutputNothing(CapturedOutput output) {
 			.build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Chat Model Completion:
+				INFO  o.s.a.c.o.ChatModelCompletionObservationHandler -- Chat Model Completion:
 				[]
 				""");
 	}
@@ -80,7 +80,7 @@ void whenEmptyCompletionThenOutputNothing(CapturedOutput output) {
 		context.setResponse(new ChatResponse(List.of(new Generation(new AssistantMessage("")))));
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Chat Model Completion:
+				INFO  o.s.a.c.o.ChatModelCompletionObservationHandler -- Chat Model Completion:
 				[]
 				""");
 	}
@@ -95,7 +95,7 @@ void whenCompletionWithTextThenOutputIt(CapturedOutput output) {
 				new Generation(new AssistantMessage("seriously, say please")))));
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Chat Model Completion:
+				INFO  o.s.a.c.o.ChatModelCompletionObservationHandler -- Chat Model Completion:
 				["say please", "seriously, say please"]
 				""");
 	}

spring-ai-model/src/test/java/org/springframework/ai/chat/observation/ChatModelPromptContentObservationHandlerTests.java

@@ -65,7 +65,7 @@ void whenEmptyPromptThenOutputNothing(CapturedOutput output) {
 			.build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Chat Model Prompt Content:
+				INFO  o.s.a.c.o.ChatModelPromptContentObservationHandler -- Chat Model Prompt Content:
 				[]
 				""");
 	}
@@ -78,7 +78,7 @@ void whenPromptWithTextThenOutputIt(CapturedOutput output) {
 			.build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Chat Model Prompt Content:
+				INFO  o.s.a.c.o.ChatModelPromptContentObservationHandler -- Chat Model Prompt Content:
 				["supercalifragilisticexpialidocious"]
 				""");
 	}
@@ -94,7 +94,7 @@ void whenPromptWithMessagesThenOutputIt(CapturedOutput output) {
 			.build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Chat Model Prompt Content:
+				INFO  o.s.a.c.o.ChatModelPromptContentObservationHandler -- Chat Model Prompt Content:
 				["you're a chimney sweep", "supercalifragilisticexpialidocious"]
 				""");
 	}

spring-ai-model/src/test/java/org/springframework/ai/image/observation/ImageModelPromptContentObservationHandlerTests.java

@@ -64,7 +64,7 @@ void whenEmptyPromptThenOutputNothing(CapturedOutput output) {
 			.build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Image Model Prompt Content:
+				INFO  o.s.a.i.o.ImageModelPromptContentObservationHandler -- Image Model Prompt Content:
 				[""]
 				""");
 	}
@@ -78,7 +78,7 @@ void whenPromptWithTextThenOutputIt(CapturedOutput output) {
 			.build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Image Model Prompt Content:
+				INFO  o.s.a.i.o.ImageModelPromptContentObservationHandler -- Image Model Prompt Content:
 				["supercalifragilisticexpialidocious"]
 				""");
 	}
@@ -94,7 +94,7 @@ void whenPromptWithMessagesThenOutputIt(CapturedOutput output) {
 			.build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Image Model Prompt Content:
+				INFO  o.s.a.i.o.ImageModelPromptContentObservationHandler -- Image Model Prompt Content:
 				["you're a chimney sweep", "supercalifragilisticexpialidocious"]
 				""");
 	}

spring-ai-vector-store/src/main/java/org/springframework/ai/vectorstore/observation/VectorStoreQueryResponseObservationHandler.java

@@ -40,7 +40,7 @@ public class VectorStoreQueryResponseObservationHandler implements ObservationHa
 
 	@Override
 	public void onStop(VectorStoreObservationContext context) {
-		logger.debug("Vector Store Query Response:\n{}", ObservabilityHelper.concatenateStrings(documents(context)));
+		logger.info("Vector Store Query Response:\n{}", ObservabilityHelper.concatenateStrings(documents(context)));
 	}
 
 	private List<String> documents(VectorStoreObservationContext context) {

spring-ai-vector-store/src/test/java/org/springframework/ai/vectorstore/observation/VectorStoreQueryResponseObservationHandlerTests.java

@@ -57,7 +57,7 @@ void whenEmptyQueryResponseThenOutputNothing(CapturedOutput output) {
 		var context = VectorStoreObservationContext.builder("db", VectorStoreObservationContext.Operation.ADD).build();
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Vector Store Query Response:
+				INFO  o.s.a.v.o.VectorStoreQueryResponseObservationHandler -- Vector Store Query Response:
 				[]
 				""");
 	}
@@ -68,7 +68,7 @@ void whenNonEmptyQueryResponseThenOutputIt(CapturedOutput output) {
 		context.setQueryResponse(List.of(new Document("doc1"), new Document("doc2")));
 		this.observationHandler.onStop(context);
 		assertThat(output).contains("""
-				Vector Store Query Response:
+				INFO  o.s.a.v.o.VectorStoreQueryResponseObservationHandler -- Vector Store Query Response:
 				["doc1", "doc2"]
 				""");
 	}