If it's been a few years, it was likely before the migration to Spanner: https://cloud.google.com/blog/products/gcp/how-google-cloud-storage-offers-strongly-co

If it's been a few years, it was likely before the migration to Spanner: https://cloud.google.com/blog/products/gcp/how-google-cloud-storage-offers-strongly-consistent-object-listing-thanks-to-spanner https://cloud.google.com/blog/products/gcp/how-google-cloud-... We posted that blog in early 2018, but stated: > Last year we migrated all of Cloud Storage metadata to Spanner, Google’s globally distributed and strongly consistent relational database. So maybe pre-2017?