user-record: add rebalanceWeight field

docs/USER_RECORD.md

@@ -507,6 +507,12 @@ the size configured in `diskSize` automatically at login time. If set to
 `shrink-and-grown` the home area is also shrunk to the minimal size possible
 (as dictated by used disk space and file system constraints) on logout.
 
+`rebalanceWeight` → An unsigned integer, `null` or a boolean. Configures the
+free disk space rebalancing weight for the home area. The integer must be in
+the range 1…10000 to configure an explicit weight. If unset, or set to `null`
+or `true` the default weight of 100 is implied. If set to 0 or `false`
+rebalancing is turned off for this home area.
+
 `service` → A string declaring the service that defines or manages this user
 record. It is recommended to use reverse domain name notation for this. For
 example, if `systemd-homed` manages a user a string of `io.systemd.Home` is
@@ -729,9 +735,10 @@ that may be used in this section are identical to the equally named ones in the
 `fileSystemUuid`, `luksDiscard`, `luksOfflineDiscard`, `luksCipher`,
 `luksCipherMode`, `luksVolumeKeySize`, `luksPbkdfHashAlgorithm`,
 `luksPbkdfType`, `luksPbkdfTimeCostUSec`, `luksPbkdfMemoryCost`,
-`luksPbkdfParallelThreads`, `rateLimitIntervalUSec`, `rateLimitBurst`,
-`enforcePasswordPolicy`, `autoLogin`, `stopDelayUSec`, `killProcesses`,
-`passwordChangeMinUSec`, `passwordChangeMaxUSec`, `passwordChangeWarnUSec`,
+`luksPbkdfParallelThreads`, `autoResizeMode`, `rebalanceWeight`,
+`rateLimitIntervalUSec`, `rateLimitBurst`, `enforcePasswordPolicy`,
+`autoLogin`, `stopDelayUSec`, `killProcesses`, `passwordChangeMinUSec`,
+`passwordChangeMaxUSec`, `passwordChangeWarnUSec`,
 `passwordChangeInactiveUSec`, `passwordChangeNow`, `pkcs11TokenUri`,
 `fido2HmacCredential`.