[google-cloud-sql-discuss] "SQLSTATE[HY000] [2006] MySQL server has gone away" error

Hi,

My SQL Cloud Instance had a problem for ~20 hours (13:27 GMT yesterday to 09:47 today), it randomly dropped connections with the following error, without any reason :

SQLSTATE[HY000] [2006] MySQL server has gone away

The graphs were also dead for this period :

I've found these errors in the logs, occurring only at the beginning and the end of this abnormal situation :

E 2018-12-18T13:27:08.099086Z 583928 [Note] Aborted connection 583928 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)
E 2018-12-18T13:27:09.334641Z 583904 [Note] Aborted connection 583904 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)
E 2018-12-18T13:27:09.335742Z 24 [Note] Aborted connection 24 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)
E 2018-12-18T13:27:11.526683Z 9 [Note] Aborted connection 9 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)
E 2018-12-19T09:47:58.863151Z 594976 [Note] Aborted connection 594976 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)
E 2018-12-19T09:47:58.864093Z 594975 [Note] Aborted connection 594975 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)
E 2018-12-19T09:47:58.914624Z 594974 [Note] Aborted connection 594974 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)
E 2018-12-19T09:48:06.935322Z 594973 [Note] Aborted connection 594973 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)

My project only uses the cloudsql/gce-proxy docker image to connect to the sql server.

Any idea what could have caused this situation ?

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