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Recent frequent insufficient resources when requesting "basic" VMs

For a week or so now our company has experienced frequent "insufficient resources" errors like:

ERROR: (gcloud.beta.compute.instances.resume) The zone 'projects/***/zones/us-east1-b' does not have enough resources available to fulfill the request. '(resource type:compute)'.
Traceback (most recent call last)

Just to be clear these request are for "basic" VMs (no GPUs, nothing fancy). We have also not hit any quotes. I understand we could switch to a different zones nevertheless that would require extra work. Is there any way to have more visibility in the resources available in a given zone? Also the error is a bit cryptic, it's not clear which resource exactly is not available (CPU, memory, etc). Has something recently changed in us-east1-b? Any help would be appreciated.

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