The infrastructure has remained stable and this has been resolved.

All sites of the affected hosting machines are now back up and we're monitoring.

Due to a power event, our infrastructure provider had suffered an outage within europe-west2-b zone. The power event is mitigated. Partial mitigation to infrastructure services will be observed within the next 30 minutes and the remaining services will be mitigated there after. https://status.cloud.google.com/incidents/Xs2XTHzAVC9YnafnPyzj

There's a status page posted by our infrastructure provider and we are waiting for resolution: https://status.cloud.google.com/incidents/Xs2XTHzAVC9YnafnPyzj

It has been confirmed that the issue is origination from our cloud infrastructure provider. Their engineering team is working on providing a solution.

We are currently investigating issues in London datacenter. It's a partial outage and our engineers are looking into it.