Repo Gardening: Add labels in batches of 30 (#53883)

Author: tbradsha

projects/github-actions/repo-gardening/changelog/fix-repo-gardening-retry_adding_labels_on_failure

@@ -0,0 +1,4 @@
+Significance: patch
+Type: fixed
+
+Labels: Add in batches of 30 to prevent timeouts.

projects/github-actions/repo-gardening/src/tasks/add-labels/index.ts

@@ -360,12 +360,16 @@ async function addLabels( payload: PullRequestEvent, octokit: OctokitClient ): P
 
 	debug( `add-labels: Adding labels ${ labelsToAdd } to PR #${ number }` );
 
-	await octokit.rest.issues.addLabels( {
-		owner: owner.login,
-		repo: name,
-		issue_number: number,
-		labels: labelsToAdd,
-	} );
+	// Large requests sometimes fail (perhaps a timeout), so add labels in batches.
+	const batchSize = 30;
+	for ( let i = 0; i < labelsToAdd.length; i += batchSize ) {
+		await octokit.rest.issues.addLabels( {
+			owner: owner.login,
+			repo: name,
+			issue_number: number,
+			labels: labelsToAdd.slice( i, i + batchSize ),
+		} );
+	}
 }
 
 export default addLabels;