问题
Firebase或GA4与BigQuery关联后，将原始数据通过每日批量导出（Daily export）的方式导出到BigQuery，但发现有很大比例的丢失，例如，Firebase或GA4每天的事件数是10万，BigQuery只有1万条记录。
原因
首先考虑GAP的合理性，Google对免费版是没有SLA承诺，会有一定的GAP，低于2%考虑是合理范围。
其次考虑限额：如免费版的BigQuery每天最多导出100万，存储只有10G
最后考虑Bug，这是一个已经知道的问题，延伸阅读：https://issuetracker.google.com/issues/369533075
Google最终回复是：
Unfortunately, we can’t fix the issue at this time and apologize for any inconvenience.
Product Engineer Team Comments: Issues like this are often specific and not part of a wider bug. Each case needs individual troubleshooting, so we recommend checking row limits, missing billing details, and ensuring expected events are exported.
If you have any further questions or need assistance with any other matter, please don’t hesitate to create a new issue on the Issue Tracker. I will now proceed to close this issue.
