Hello,
Just to confirm there is no official issue going on for the zone eu-north1-a. It seems like you are affected by the disk stockout for that zone.
First, our apologies that the Google Cloud resources you need are not currently
available. Our goal is to make sure that there are resources in all zones.
A stockout occurs when GCE rejects a VM-creation request and the customer is not at fault (that is, the customer has sufficient quota, the request is well-formed, and the zone supports the requested kind of VM). In these cases stockouts occur due to a lack of one more resources in the zone / region where the VM-creation request was made.
We recommend deploying and balancing your workload across multiple zones and
regions to reduce the likelihood of an outage and have access to multiple
resource pools when you need to expand quickly. Please review our
documentation which outlines how to build resilient and scalable
architectures on Google Cloud Platform. Please note that you are currently using
Google Cloud on-demand without a guarantee of capacity. We now offer a feature
called reservations that guarantees Google Cloud capacity, see our
documentation for details on how to use this feature.