Note at-since from #6228 and #6237 (#6252)

Co-authored-by: Daniel Beck <daniel-beck@users.noreply.github.com>

core/src/main/java/hudson/lifecycle/Lifecycle.java

@@ -254,6 +254,8 @@ public boolean canRestart() {
     /**
      * Called when Jenkins startup is finished or when Jenkins has finished reloading its
      * configuration.
+     *
+     * @since 2.333
      */
     public void onReady() {
         LOGGER.log(Level.INFO, "Jenkins is fully up and running");
@@ -264,6 +266,8 @@ public void onReady() {
      *
      * <p>Callers must also send an {@link #onReady()} notification when Jenkins has finished
      * reloading its configuration.
+     *
+     * @since 2.333
      */
     public void onReload(@NonNull String user, @CheckForNull String remoteAddr) {
         if (remoteAddr != null) {
@@ -278,6 +282,8 @@ public void onReload(@NonNull String user, @CheckForNull String remoteAddr) {
 
     /**
      * Called when Jenkins is beginning its shutdown.
+     *
+     * @since 2.333
      */
     public void onStop(@NonNull String user, @CheckForNull String remoteAddr) {
         if (remoteAddr != null) {
@@ -297,6 +303,8 @@ public void onStop(@NonNull String user, @CheckForNull String remoteAddr) {
      *
      * @param timeout The amount by which to extend the timeout.
      * @param unit The time unit of the timeout argument.
+     *
+     * @since TODO
      */
     public void onExtendTimeout(long timeout, @NonNull TimeUnit unit) {}
 
@@ -305,6 +313,8 @@ public void onExtendTimeout(long timeout, @NonNull TimeUnit unit) {}
      *
      * @param status The status string. This is free-form and can be used for various purposes:
      *     general state feedback, completion percentages, human-readable error message, etc.
+     *
+     * @since 2.333
      */
     public void onStatusUpdate(String status) {
         LOGGER.log(Level.INFO, status);