Add @since tags for new public methods. (#3209)

* Add @since tags for new public methods.

* remove errant since tags

api/all/src/main/java/io/opentelemetry/api/trace/Span.java

@@ -173,6 +173,7 @@ public interface Span extends ImplicitContextKeyed {
    *
    * @param attributes the attributes
    * @return this.
+   * @since 1.2.0
    */
   @SuppressWarnings("unchecked")
   default Span setAllAttributes(Attributes attributes) {

api/all/src/main/java/io/opentelemetry/api/trace/SpanBuilder.java

@@ -234,6 +234,7 @@ public interface SpanBuilder {
    *
    * @param attributes the attributes
    * @return this.
+   * @since 1.2.0
    */
   @SuppressWarnings("unchecked")
   default SpanBuilder setAllAttributes(Attributes attributes) {

exporters/zipkin/src/main/java/io/opentelemetry/exporter/zipkin/ZipkinSpanExporterBuilder.java

@@ -70,6 +70,7 @@ public final class ZipkinSpanExporterBuilder {
    * Sets the maximum time to wait for the export of a batch of spans. If unset, defaults to 10s.
    *
    * @return this.
+   * @since 1.2.0
    */
   public ZipkinSpanExporterBuilder setReadTimeout(long timeout, TimeUnit unit) {
     requireNonNull(unit, "unit");
@@ -82,6 +83,7 @@ public final class ZipkinSpanExporterBuilder {
    * Sets the maximum time to wait for the export of a batch of spans. If unset, defaults to 10s.
    *
    * @return this.
+   * @since 1.2.0
    */
   public ZipkinSpanExporterBuilder setReadTimeout(Duration timeout) {
     requireNonNull(timeout, "timeout");

sdk/metrics/src/main/java/io/opentelemetry/sdk/metrics/aggregator/AggregatorFactory.java

@@ -43,6 +43,7 @@ public interface AggregatorFactory {
    *
    * @param temporality configures what temporality to be produced for the Sum metrics.
    * @return an {@code AggregationFactory} that calculates sum of recorded measurements.
+   * @since 1.2.0
    */
   static AggregatorFactory sum(AggregationTemporality temporality) {
     return new SumAggregatorFactory(temporality);