Add since annotations

Author: jack-berg

sdk/metrics/src/main/java/io/opentelemetry/sdk/metrics/ExemplarFilter.java

@@ -17,6 +17,7 @@
  * reservoir ({@link DoubleExemplarReservoir}, {@link LongExemplarReservoir}.
  *
  * @see SdkMeterProviderBuilder#setExemplarFilter(ExemplarFilter)
+ * @since 1.56.0
  */
 // TODO(jack-berg): Have methods when custom filters are supported.
 @SuppressWarnings("InterfaceWithOnlyStatics")

sdk/metrics/src/main/java/io/opentelemetry/sdk/metrics/SdkMeterProviderBuilder.java

@@ -81,7 +81,11 @@ public SdkMeterProviderBuilder addResource(Resource resource) {
     return this;
   }
 
-  /** Set the {@link ExemplarFilter} used for all instruments from all meters. */
+  /**
+   * Set the {@link ExemplarFilter} used for all instruments from all meters.
+   *
+   * @since 1.56.0
+   */
   public SdkMeterProviderBuilder setExemplarFilter(ExemplarFilter filter) {
     this.exemplarFilter = ExemplarFilterInternal.asExemplarFilterInternal(filter);
     return this;