Alexander Kukushkin 2efd97baab Permanent replication slots (#819) ...

Permanent replication slots are preserved on failover/switchover, that is Patroni on the new primary will create configured replication slots right after doing promote.

Slots could be configured with the help of `patronictl edit-config`.
The initial configuration could be also done in the `bootstrap.dcs`

```yaml
slots:
  permanent_physical_1:
    type: physical
  permanent_logical_1:
    type: logical
    database: foo
    plugin: pgoutput
```

It is the responsibility of the operator to make sure that there are no clashes in names between replication slots automatically created by Patroni for members and permanent replication slots.

Closes https://github.com/zalando/patroni/issues/656

2018-10-31 11:37:42 +01:00

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