[google-cloud-sql-discuss] [Note] Aborted connection ... (Got an error reading communication packets)

Hi, 

I've found an error in my MySQL ( MySQL 2nd Gen 5.7 ondb-n1-standard-1 ) error log and a pattern, this "Aborted connection" error always appears before this insert: "INSERT INTO mysql.heartbeat(id, master_time)..."

A  2018-05-17T18:43:29.415379Z	638401 Query	INSERT INTO mysql.heartbeat(id, master_time)   E  2018-05-17T18:43:29.191513Z 638442 [Note] Aborted connection 638442 to db: 'xxxxxxxxx' user: 'root' host: 'cloudsqlproxy~74.125.182.17' (Got an error reading communication packets) 

A  2018-05-17T18:43:19.358269Z	638401 Query	INSERT INTO mysql.heartbeat(id, master_time)   E  2018-05-17T18:43:19.308447Z 638440 [Note] Aborted connection 638440 to db: 'xxxxxxxxx' user: 'root' host: 'cloudsqlproxy~173.194.90.33' (Got an error reading communication packets)

My database has high availability enabled, and for what I had seen, that insert corresponds to Percora Toolkit  / Monitor MySQL replication delay (https://www.percona.com/doc/percona-toolkit/LATEST/pt-heartbeat.html)

Maybe it's related to this Cloud SQL Proxy too: https://github.com/GoogleCloudPlatform/cloudsql-proxy/issues/126

I think the connection that executes that insert is not properly being managed.

Thanks

Fabio

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