You can manually create the _Trace observability bucket before your project receives trace data.

You can manually create the _Trace observability bucket before your project receives trace data. When creating the bucket, you must specify a storage location. Google Cloud Observability applies the Cloud KMS key defined in your default settings unless you explicitly specify a different key in your create request.

For more information, see the following documents:

• Create observability buckets • Set defaults for observability buckets