feat: add gcs_metrics_uri for exporting tuning job metrics.

src/main/java/com/google/genai/Tunings.java

@@ -2122,6 +2122,13 @@ ObjectNode tuningJobFromVertex(
               rootObject));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"gcsMetricsUri"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"gcsMetricsUri"},
+          Common.getValueByPath(fromObject, new String[] {"gcsMetricsUri"}));
+    }
+
     return toObject;
   }
 

src/main/java/com/google/genai/types/TuningJob.java

@@ -217,6 +217,10 @@ public abstract class TuningJob extends JsonSerializable {
   @JsonProperty("distillationSamplingSpec")
   public abstract Optional<DistillationSamplingSpec> distillationSamplingSpec();
 
+  /** The Cloud Storage metrics URI associated with this tuning job. */
+  @JsonProperty("gcsMetricsUri")
+  public abstract Optional<String> gcsMetricsUri();
+
   /** Instantiates a builder for TuningJob. */
   @ExcludeFromGeneratedCoverageReport
   public static Builder builder() {
@@ -1122,6 +1126,24 @@ public Builder clearDistillationSamplingSpec() {
       return distillationSamplingSpec(Optional.empty());
     }
 
+    /**
+     * Setter for gcsMetricsUri.
+     *
+     * <p>gcsMetricsUri: The Cloud Storage metrics URI associated with this tuning job.
+     */
+    @JsonProperty("gcsMetricsUri")
+    public abstract Builder gcsMetricsUri(String gcsMetricsUri);
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder gcsMetricsUri(Optional<String> gcsMetricsUri);
+
+    /** Clears the value of gcsMetricsUri field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearGcsMetricsUri() {
+      return gcsMetricsUri(Optional.empty());
+    }
+
     public abstract TuningJob build();
   }