download mysql slow query log on google cloud sql
After a lot of digging I found an answer.  It is not perfect as the quality of data may need some massaging, but it works.
gcloud logging read projects/yourproject/logs/cloudsql.googleapis.com%2Fmysql-slow.log --format json| jq -rnc --stream 'fromstream(1|truncate_stream(inputs)) | .textPayload' &gt; slow-log-timestamp.log