此前某网友的甲骨文云收到机器被回收的邮件：

Oracle Cloud Infrastructure Customer,

Oracle Cloud Infrastructure (OCI) has reclaimed idle Always Free compute resources from Always Free customers by stopping the compute instance(s). Reclaiming idle resources allows OCI to efficiently provide services to Always Free customers. Your account had one or more idle compute instances that have been stopped. You can restart your compute instance as long as the associated compute shape is available in your region. Your Boot and Block Volumes remain unchanged and available to you. In the future, you can keep idle compute instances from being stopped by converting your account to Pay As You Go (PAYG). With PAYG, you will not be charged as long as your usage for all OCI resources remains within the Always Free limits.

低于长时间闲置的云服务器甲骨文将会自动关机以节省资源。
现在甲骨文已经公布详细的闲置云服务器回收规则，遗憾的是对于闲置的机器是回收而非停机因此影响较大。
之前网友们通过各种卡薅的甲骨文免费实例要用起来，不然被回收后再想开新机器估计没有配额没法再开通。
当然好消息是既然有闲置机器被回收那甲骨文「可能」还会放出更多配额，那后来的用户估计也能开新机器。
然而考虑到现在整个行业不景气甲骨文也在裁员，鬼知道这些闲置机器被回收后甲骨文还会不会继续放配额。

以下是闲置回收规则：

1.时间周期：本规则适用于甲骨文云计算的永久免费实例，计算周期为七天，七天内触发条件可能会被回收。
2.处理器闲置率：在本周期内也就是七天内的 95% 的时间，CPU使用率都低于10% 则服务器可能会被回收。
3.网络利用率：在本周期内如果服务器的网络利用率低于10%则视为闲置机器，可能会被甲骨文回收服务器。
4.内存利用率：此条仅适用于A1型也就是ARM机器 , 在本周期内内存利用率低于 10% 也被视作是闲置机器。

由于使用规则里并没有提到以上三种条件同时满足还是其中一条满足就属于闲置机器，一个老外在甲骨文相关团队里提出这个问题：

I understand that this had to be introduced but it could have been done much better, with proper information upfront, not via email with blackmail to upgrade account otherwise my VM will be shut down. Now I don't want to upgrade because on paid account Oracle might do some other similar "trick" with changing what's free and what's not but in this case I will know when my credit card will be charged...
Also it's not clearly written if all the conditions needs to be met to consider the instance as idle. F.e. if I have average CPU utilization of 25% but network is less than 1% busy - is my instance idle or not?
Last but not least - this should be clearly visible in cloud console which instance is currently considered idle.

官方人员的答复为：

I now have the confirmation from the Product Management that all mentioned conditions must be true during the 7-day period in order for the reclamation action to kick in. So, if only one condition is true - no reclamation should be triggered. They will be amending the language to be more clear in the future. I thank you for your feedback and helping us improve

也就是说只要满足其中一个条件就不会被回收了。