In the logs a bunch or connection timeouts appear.
database_1 | 2019-04-20 14:38:04 10 [Warning] Aborted connection 10 to db: 'mailmandb' user: 'mailman' host: '172.24.0.4' (Got an error reading communication packets)
database_1 | 2019-04-20 14:48:09 12 [Warning] Aborted connection 12 to db: 'mailmandb' user: 'mailman' host: '172.24.0.4' (Got timeout reading communication packets)
database_1 | 2019-04-20 14:48:53 19 [Warning] Aborted connection 19 to db: 'mailmandb' user: 'mailman' host: '172.24.0.4' (Got timeout reading communication packets)
database_1 | 2019-04-20 14:48:53 20 [Warning] Aborted connection 20 to db: 'mailmandb' user: 'mailman' host: '172.24.0.4' (Got timeout reading communication packets)
database_1 | 2019-04-20 14:48:54 22 [Warning] Aborted connection 22 to db: 'mailmandb' user: 'mailman' host: '172.24.0.4' (Got timeout reading communication packets)
database_1 | 2019-04-20 14:48:54 23 [Warning] Aborted connection 23 to db: 'mailmandb' user: 'mailman' host: '172.24.0.4' (Got timeout reading communication packets)
database_1 | 2019-04-20 14:48:55 24 [Warning] Aborted connection 24 to db: 'mailmandb' user: 'mailman' host: '172.24.0.4' (Got timeout reading communication packets)
database_1 | 2019-04-20 14:48:55 25 [Warning] Aborted connection 25 to db: 'mailmandb' user: 'mailman' host: '172.24.0.4' (Got timeout reading communication packets)
database_1 | 2019-04-20 14:48:55 26 [Warning] Aborted connection 26 to db: 'mailmandb' user: 'mailman' host: '172.24.0.4' (Got timeout reading communication packets)
database_1 | 2019-04-20 14:48:56 27 [Warning] Aborted connection 27 to db: 'mailmandb' user: 'mailman' host: '172.24.0.4' (Got timeout reading communication packets)
In the logs a bunch or connection timeouts appear.