Hi,
If your app uses a volume, it may have been auto-stopped, and when it attempts to restart, it can’t because the particular host on which it used to live doesn’t have enough capacity for it.
If an app does not use a volume, it can be instantiated on a different host with enough capacity; so the main blocker here is very likely the use of volumes.
There’s a more detailed explanation here complete with some suggestions on what to do, the “Move machines with attached volumes” section would apply. Just beware, if you do have data you need to keep in your volume, you need to clone --from-snapshot to ensure your data is brought over, and ensure the new machine does have all your old data before deleting the old one and its volume.
The clone will instantiate the new machine on a different host with enough capacity.
Cheers,
- Daniel