curl -X POST http://127.0.0.1:20590/api/releases/gray/promote
预期响应:{"ok": true, "percent": 5, "state": "灰度中"}; 预检未通过时该接口返回 precheck_required。
{"ok": true, "percent": 5, "state": "灰度中"}
precheck_required
GET /api/channels/prod
gray