feat(repo): add gemini-cli-bot metrics and workflows (#25888)

tools/gemini-cli-bot/metrics/scripts/open_prs.ts

@@ -0,0 +1,20 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { execSync } from 'node:child_process';
+
+try {
+  const count = execSync(
+    'gh pr list --state open --limit 1000 --json number --jq length',
+    {
+      encoding: 'utf-8',
+    },
+  ).trim();
+  console.log(`open_prs,${count}`);
+} catch {
+  // Fallback if gh fails or no PRs found
+  console.log('open_prs,0');
+}