| applicationName | string matching [A-Za-z_][A-Za-z0-9_$-]* | Standby application name reported to the primary. |
| hotStandby | boolean | Allow read-only queries while the server is in recovery. |
| maxReplicationSlots | signed integer | Maximum replication slots retained by this server. |
| maxWalSenders | signed integer | Maximum concurrent WAL sender processes. |
| passfile | submodule or null | Opaque reference to a libpq passfile used by a standby. |
| primary | submodule or null | Primary endpoint used by a standby. |
| slot | string matching [A-Za-z_][A-Za-z0-9_$-]* or null | Optional physical replication slot consumed by the standby. |
| user | string matching [A-Za-z_][A-Za-z0-9_$-]* | Database role used by a standby connection. |
| walLevel | one of ["minimal","replica","logical"] | Write-ahead log detail retained for recovery and replication. |