This is a networking issue, and your data is safe. Cloud SQL stores instance metadata regionally, so it shares a failure domain with the data it describes. When the region is down or inaccessible, instances are missing from the list results, but that doesn't say anything about the instance availability from within region.
That's good to know. What confuses me is why they're saying "We continue to experience high levels of network congestion in the eastern USA", when I'm in us-west2 (Los Angeles) and none of my CloudSQL instances, nor is my k8s cluster showing up or contactable...
This is a networking issue, and your data is safe. Cloud SQL stores instance metadata regionally, so it shares a failure domain with the data it describes. When the region is down or inaccessible, instances are missing from the list results, but that doesn't say anything about the instance availability from within region.