[google-cloud-sql-discuss] CloudSQL HA binary log retention

I am running CloudSQL with HA enabled and one read replica. Recently I notices that the used space of the primary instance is larger than the read replica (more than 10%). It turned out that there is a lot of binary logs (68 files). I have also noticed that the expire_logs_days is set to 0 which means that there is no automatic removal. How am I supposed to manage the retention of the binary logs ?

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