add obsoelte annotation

java-core/google-cloud-core/src/main/java/com/google/cloud/Timestamp.java

@@ -18,6 +18,7 @@
 
 import static com.google.common.base.Preconditions.checkArgument;
 
+import com.google.api.core.ObsoleteApi;
 import com.google.protobuf.util.Timestamps;
 import java.io.Serializable;
 import java.time.Instant;
@@ -190,6 +191,7 @@ public com.google.protobuf.Timestamp toProto() {
   }
 
   /** This method is obsolete. Use {@link #parseTimestampDuration(String)} instead */
+  @ObsoleteApi("Use parseTimestampDuration(String) instead")
   public static Timestamp parseTimestamp(String timestamp) {
     try {
       return parseTimestampDuration(timestamp);

java-core/google-cloud-core/src/main/java/com/google/cloud/testing/BaseEmulatorHelper.java

@@ -116,6 +116,7 @@ protected final void startProcess(String blockUntilOutput)
   }
 
   /** This method is obsolete. Use {@link #waitForProcessDuration(java.time.Duration)} instead */
+  @ObsoleteApi("Use waitForProcessDuration(java.time.Duration) instead")
   protected final int waitForProcess(org.threeten.bp.Duration timeout)
       throws IOException, InterruptedException, TimeoutException {
     return waitForProcessDuration(toJavaTimeDuration(timeout));