chore: revert telemetry stabilization

Revert Java PR #809 as a release contingency.

This reverts commit 6c24e07.

Exporter publishing configuration remains unchanged.

Author: hln33

sdk/src/main/java/software/amazon/lambda/durable/plugin/InvocationEndInfo.java

@@ -4,6 +4,7 @@
 
 import java.time.Instant;
 import java.util.Map;
+import software.amazon.lambda.durable.annotations.Experimental;
 
 /**
  * Information provided at the end of a Lambda invocation.
@@ -17,9 +18,9 @@
  * @param executionStartTime the stable start timestamp of the durable execution
  * @param operations a snapshot of operations known when the invocation ended, keyed by operation ID
  * @param invocationStatus the invocation outcome
- * @param executionError non-null if the execution failed
- * @param executionInput the deserialized execution input
- * @param executionResult the value returned by a successful handler
+ * @param executionError non-null if the execution failed; this component is experimental
+ * @param executionInput the deserialized execution input; this component is experimental
+ * @param executionResult the value returned by a successful handler; this component is experimental
  */
 public record InvocationEndInfo(
         String requestId,
@@ -28,9 +29,9 @@ public record InvocationEndInfo(
         Instant executionStartTime,
         Map<String, OperationChangeItemInfo> operations,
         InvocationStatus invocationStatus,
-        Throwable executionError,
-        Object executionInput,
-        Object executionResult) {
+        @Experimental Throwable executionError,
+        @Experimental Object executionInput,
+        @Experimental Object executionResult) {
 
     /** Creates invocation-end information without execution payloads or operation state. */
     public InvocationEndInfo(

sdk/src/main/java/software/amazon/lambda/durable/plugin/InvocationInfo.java

@@ -6,6 +6,7 @@
 
 import java.time.Instant;
 import java.util.Map;
+import software.amazon.lambda.durable.annotations.Experimental;
 
 /**
  * Invocation-level information available to plugin hooks.
@@ -19,8 +20,10 @@
  * @param executionStartTime the start timestamp of the durable execution, taken from the initial EXECUTION operation in
  *     the first event delivered by the backend. Never null and stable across all invocations of the same execution.
  * @param executionInput the deserialized execution input passed to the user handler, or null when unavailable
- * @param operations checkpointed operations delivered at invocation start, keyed by operation ID
- * @param updatedOperations operations changed externally since the previous invocation, keyed by operation ID
+ * @param operations checkpointed operations delivered at invocation start, keyed by operation ID; this component is
+ *     experimental
+ * @param updatedOperations operations changed externally since the previous invocation, keyed by operation ID; this
+ *     component is experimental
  * @param xRayTraceId immutable invocation-local X-Ray header; null means unavailable and permits legacy carrier
  *     fallback, while an empty string means an available runtime supplied no header
  */
@@ -29,9 +32,9 @@ public record InvocationInfo(
         String durableExecutionArn,
         boolean isFirstInvocation,
         Instant executionStartTime,
-        Object executionInput,
-        Map<String, OperationChangeItemInfo> operations,
-        Map<String, OperationChangeItemInfo> updatedOperations,
+        @Experimental Object executionInput,
+        @Experimental Map<String, OperationChangeItemInfo> operations,
+        @Experimental Map<String, OperationChangeItemInfo> updatedOperations,
         String xRayTraceId) {
 
     public InvocationInfo {

sdk/src/main/java/software/amazon/lambda/durable/plugin/OperationChangeItemInfo.java

@@ -4,6 +4,7 @@
 
 import java.time.Instant;
 import software.amazon.awssdk.services.lambda.model.OperationStatus;
+import software.amazon.lambda.durable.annotations.Experimental;
 
 /**
  * Operation-level information for an {@link OperationChangeInfo} and invocation operation snapshot.
@@ -18,8 +19,8 @@
  * @param status operation status
  * @param attempt attempt number for retriable operations, null for others
  * @param isReplay true if this operation was present in state delivered at invocation start
- * @param error non-null if the operation failed
- * @param result checkpointed serialized result, or null if unavailable
+ * @param error non-null if the operation failed; this component is experimental
+ * @param result checkpointed serialized result, or null if unavailable; this component is experimental
  */
 public record OperationChangeItemInfo(
         String id,
@@ -32,8 +33,8 @@ public record OperationChangeItemInfo(
         OperationStatus status,
         Integer attempt,
         boolean isReplay,
-        Throwable error,
-        String result) {
+        @Experimental Throwable error,
+        @Experimental String result) {
 
     /** Returns a representation that omits the operation result payload. */
     @Override

sdk/src/main/java/software/amazon/lambda/durable/plugin/OperationEndInfo.java

@@ -3,6 +3,7 @@
 package software.amazon.lambda.durable.plugin;
 
 import java.time.Instant;
+import software.amazon.lambda.durable.annotations.Experimental;
 
 /**
  * Extended operation information for operation end events.
@@ -17,8 +18,9 @@
  * @param status the operation's terminal status (e.g., SUCCEEDED, FAILED, TIMED_OUT) — may be null for virtual ops
  * @param attempt the total number of attempts for retriable operations (STEP, WAIT_FOR_CONDITION) — null for others
  * @param isReplay true if this operation already existed in the execution state (completed in a prior invocation)
- * @param error non-null if the operation failed
- * @param result the serialized result of the operation, or null if the operation failed or has no result
+ * @param error non-null if the operation failed; this component is experimental
+ * @param result the serialized result of the operation, or null if the operation failed or has no result; this
+ *     component is experimental
  */
 public record OperationEndInfo(
         String id,
@@ -31,8 +33,8 @@ public record OperationEndInfo(
         String status,
         Integer attempt,
         boolean isReplay,
-        Throwable error,
-        String result) {
+        @Experimental Throwable error,
+        @Experimental String result) {
 
     /**
      * Creates operation-end information without a result.

sdk/src/main/java/software/amazon/lambda/durable/plugin/UserFunctionEndInfo.java

@@ -3,6 +3,7 @@
 package software.amazon.lambda.durable.plugin;
 
 import java.time.Instant;
+import software.amazon.lambda.durable.annotations.Experimental;
 
 /**
  * Information provided when a user function finishes executing.
@@ -19,7 +20,7 @@
  * @param isReplay true if this operation was present in the checkpointed state delivered at invocation start
  * @param attempt 1-based attempt number for steps/waitForCondition, null for context operations
  * @param outcome the user function outcome
- * @param error non-null if the user function failed or exited incompletely
+ * @param error non-null if the user function failed or exited incompletely; this component is experimental
  */
 public record UserFunctionEndInfo(
         String id,
@@ -32,4 +33,4 @@ public record UserFunctionEndInfo(
         boolean isReplay,
         Integer attempt,
         UserFunctionOutcome outcome,
-        Throwable error) {}
+        @Experimental Throwable error) {}

telemetry-exporter/README.md

@@ -1,10 +1,14 @@
-# Durable Execution Telemetry Exporter
+# Durable Execution Telemetry Exporter (preview)
 
 Instrumentation plugin for the AWS Lambda Durable Execution Java SDK that emits a curated,
 per-execution **Durable Execution Telemetry record** to one or more pluggable exporters. It ports the
 JavaScript `durableExecutionTelemetry()` contract (canonical record schema `1.0`) to the Java plugin hook
 surface.
 
+> **Preview API.** Every public type is annotated
+> `@software.amazon.lambda.durable.annotations.Experimental` to signal it is experimental and may
+> change or be removed in a future release without a major-version bump.
+
 ## Usage
 
 ```java

telemetry-exporter/src/main/java/software/amazon/lambda/durable/telemetry/ArnParser.java

@@ -2,12 +2,15 @@
 // SPDX-License-Identifier: Apache-2.0
 package software.amazon.lambda.durable.telemetry;
 
+import software.amazon.lambda.durable.annotations.Experimental;
+
 /**
  * Parses the durable execution ARN into its component fields, mirroring the JS {@code parseExecutionArn}.
  *
  * <p>Format:
  * {@code arn:<partition>:lambda:<region>:<accountId>:function:<functionName>:<qualifier>/durable-execution/<executionName>/<invocationId>}.
  */
+@Experimental
 public final class ArnParser {
     private final String functionName;
     private final String qualifier;

telemetry-exporter/src/main/java/software/amazon/lambda/durable/telemetry/ContentConfig.java

@@ -5,6 +5,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Function;
+import software.amazon.lambda.durable.annotations.Experimental;
 
 /**
  * Controls what data is included in emitted records (input/output transforms, operation overrides, error inclusion).
@@ -23,6 +24,7 @@
  * the cached input snapshot or any later emission — and a non-fatal transform failure omits the field and is logged.
  * VM/thread-termination errors propagate.
  */
+@Experimental
 public final class ContentConfig {
     private final boolean includeInput;
     private final Function<Object, Object> inputTransform;

telemetry-exporter/src/main/java/software/amazon/lambda/durable/telemetry/DurableExecutionTelemetry.java

@@ -7,6 +7,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import software.amazon.awssdk.services.lambda.model.ErrorObject;
+import software.amazon.lambda.durable.annotations.Experimental;
 import software.amazon.lambda.durable.exception.DurableOperationException;
 import software.amazon.lambda.durable.exception.UnrecoverableDurableExecutionException;
 import software.amazon.lambda.durable.plugin.DurableExecutionPluginFactory;
@@ -41,6 +42,7 @@
  * {@link TelemetrySettings}, the exporters, and the {@link ExportScheduler} that serializes exports across every
  * execution the environment hosts.
  */
+@Experimental
 public final class DurableExecutionTelemetry {
 
     private static final Logger logger = LoggerFactory.getLogger(DurableExecutionTelemetry.class);

telemetry-exporter/src/main/java/software/amazon/lambda/durable/telemetry/DurableExecutionTelemetryConfig.java

@@ -4,18 +4,22 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import software.amazon.lambda.durable.annotations.Experimental;
 
 /** Configuration for the Durable Execution Telemetry plugin. Mirrors the JS {@code DurableExecutionTelemetryConfig}. */
+@Experimental
 public final class DurableExecutionTelemetryConfig {
 
     /** When records are emitted. */
+    @Experimental
     public enum EmitMode {
         ON_COMPLETE,
         ON_CHANGE,
         ON_FAILURE
     }
 
     /** Which operations to include in each record's operations array. */
+    @Experimental
     public enum OperationDetail {
         TOP_LEVEL,
         FULL_TREE