Hi,
I just reboot this RE and seems it gets some quite free space.
> show system storage
Filesystem Size Used Avail Capacity Mounted on
/dev/md0.uzip 20M 20M 0B 100% /
devfs 1.0K 1.0K 0B 100% /dev
/dev/gpt/junos 19G 2.2G 15G 12% /.mount
devfs 1.0K 1.0K 0B 100% /.mount/dev
/dev/md1.uzip 22M 22M 0B 100% /.mount/packages/mnt/os-libs-10
/dev/md2.uzip 21M 21M 0B 100% /.mount/packages/mnt/os-runtime
tmpfs 15G 8.2M 15G 0% /.mount/tmp
procfs 4.0K 4.0K 0B 100% /.mount/proc
/dev/md3.uzip 1.3M 1.3M 0B 100% /.mount/packages/mnt/os-zoneinfo64-7c66f0e5
/dev/md4.uzip 18M 18M 0B 100% /.mount/packages/mnt/os-libs-compat32-10
/dev/md5.uzip 498K 498K 0B 100% /.mount/packages/mnt/os-compat32
/dev/md6.uzip 6.5M 6.5M 0B 100% /.mount/packages/mnt/py-extensions32-abd0b0d2
/dev/md7.uzip 14M 14M 0B 100% /.mount/packages/mnt/py-base32-0bd29269
/dev/md8.uzip 6.8M 6.8M 0B 100% /.mount/packages/mnt/os-crypto
/dev/md9.uzip 15M 15M 0B 100% /.mount/packages/mnt/junos-net
/dev/md10.uzip 32M 32M 0B 100% /.mount/packages/mnt/junos-modules64-ee72e699
/dev/md11.uzip 23M 23M 0B 100% /.mount/packages/mnt/junos-modules-mx64-1fd89b3d
/dev/md12.uzip 6.8M 6.8M 0B 100% /.mount/packages/mnt/junos-libs
/dev/md13.uzip 50M 50M 0B 100% /.mount/packages/mnt/junos-libs-compat32
/dev/md14.uzip 706M 706M 0B 100% /.mount/packages/mnt/junos-runtime32-6f81f614
/packages/mnt/junos-libs-compat32/usr/lib32 50M 50M 0B 100% /.mount/packages/mnt/junos-runtime32-6f81f614/web-api/libs/junos
/packages/mnt/os-libs-compat32-10/usr/lib32 18M 18M 0B 100% /.mount/packages/mnt/junos-runtime32-6f81f614/web-api/libs/os
/packages/mnt/os-compat32/libexec 498K 498K 0B 100% /.mount/packages/mnt/junos-runtime32-6f81f614/web-api/libexec
/var/jails/rest-api 19G 2.2G 15G 12% /.mount/packages/mnt/junos-runtime32-6f81f614/web-api/var
/dev/md15 25M 25M 0B 100% /.mount/packages/mnt/jweb32-238e4e8a
/var/jail 19G 2.2G 15G 12% /.mount/packages/mnt/jweb32-238e4e8a/jail/var
/var/log 19G 2.2G 15G 12% /.mount/packages/mnt/jweb32-238e4e8a/jail/var/log
devfs 1.0K 1.0K 0B 100% /.mount/packages/mnt/jweb32-238e4e8a/jail/dev
/dev/md16 16M 16M 0B 100% /.mount/packages/mnt/jweb32-238e4e8a/jail/rt
/dev/md17 23M 23M 0B 100% /.mount/packages/mnt/jweb-ex32-99419e7a
/var/jail/etc 19G 2.2G 15G 12% /.mount/packages/mnt/jweb-ex32-99419e7a/jail/var/etc
/var/jail/run 19G 2.2G 15G 12% /.mount/packages/mnt/jweb-ex32-99419e7a/jail/var/run
/var/jail/tmp 19G 2.2G 15G 12% /.mount/packages/mnt/jweb-ex32-99419e7a/jail/var/tmp
/var/tmp 19G 2.2G 15G 12% /.mount/packages/mnt/jweb-ex32-99419e7a/jail/var/tmp/uploads
devfs 1.0K 1.0K 0B 100% /.mount/packages/mnt/jweb-ex32-99419e7a/jail/dev
/dev/md18 16M 16M 0B 100% /.mount/packages/mnt/jweb-ex32-99419e7a/jail/rt
/var/jail/jweb-app 19G 2.2G 15G 12% /.mount/packages/mnt/jweb-ex32-99419e7a/jail/var/jweb-app
/dev/md19.uzip 1.6M 1.6M 0B 100% /.mount/packages/mnt/junos-libs-compat32-mx
/dev/md20.uzip 319M 319M 0B 100% /.mount/packages/mnt/junos-runtime-mx32-bf88d705
/dev/md21.uzip 49M 49M 0B 100% /.mount/packages/mnt/junos-platform
/dev/md22.uzip 436K 436K 0B 100% /.mount/packages/mnt/junos-libs-mx
/dev/md23.uzip 8.5M 8.5M 0B 100% /.mount/packages/mnt/junos-dp-crypto-support32-4ccd9b0d
/dev/md24.uzip 35M 35M 0B 100% /.mount/packages/mnt/junos-dp-crypto-support-mtx32-6758b268
/dev/md25.uzip 84M 84M 0B 100% /.mount/packages/mnt/junos-daemons64-da1233df
/dev/md26.uzip 23M 23M 0B 100% /.mount/packages/mnt/junos-daemons-mx64-4a7e05af
/dev/md27.uzip 14M 14M 0B 100% /.mount/packages/mnt/jsdn32-2194d8c6
/dev/md28.uzip 7.6M 7.6M 0B 100% /.mount/packages/mnt/jsd32-96d52eea
/dev/md29.uzip 546M 546M 0B 100% /.mount/packages/mnt/jpfe-wrlinux32-47960b77
/dev/md30.uzip 1.2G 1.2G 0B 100% /.mount/packages/mnt/jpfe-X96032-2fa4ce20
/dev/md31.uzip 63M 63M 0B 100% /.mount/packages/mnt/jpfe-common32-df510a2e
/dev/md32.uzip 13M 13M 0B 100% /.mount/packages/mnt/jdocs32-32683b60
/dev/md33.uzip 14M 14M 0B 100% /.mount/packages/mnt/fips-mode32-275db1b1
tmpfs 2.7G 30M 2.6G 1% /.mount/mfs
junosprocfs 4.0K 4.0K 0B 100% /.mount/junosproc
% du -sh /var/*
4.0K /var/chroot
4.0K /var/crash
8.0K /var/cron
du: /var/db/certs/common: Permission denied
du: /var/db/certs/system-key-pair: Permission denied
du: /var/db/certs/system-cert: Permission denied
du: /var/db/entropy: Permission denied
du: /var/db/fsad: Permission denied
du: /var/db/jdhcp_snoop: Permission denied
126M /var/db
4.0K /var/empty
0B /var/etc
28M /var/home
152K /var/jail
16K /var/jails
237M /var/log
728K /var/logical-systems
3.0M /var/pdb
8.0K /var/platform-config
4.0K /var/preserve
232K /var/run
39M /var/rundb
20K /var/tftpboot
24K /var/tmp
8.0K /var/transfer
% du -sh /*
0B /COPYRIGHT
4.0K /bin
316K /boot
264K /config
5.0K /dev
212K /etc
0B /jail
0B /junosproc
16K /lib
4.0K /libexec
20M /mfs
4.0K /mnt
32K /modules
4.0K /mqtt_broker_re.pid
4.0K /oam
460K /opt
5.3G /packages
0B /proc
8.0K /root
12K /sbin
8.2M /tmp
1.4M /usr
du: /var/db/certs/common: Permission denied
du: /var/db/certs/system-key-pair: Permission denied
du: /var/db/certs/system-cert: Permission denied
du: /var/db/entropy: Permission denied
du: /var/db/fsad: Permission denied
du: /var/db/jdhcp_snoop: Permission denied
434M /var
% du -sh /*
0B /COPYRIGHT
4.0K /bin
316K /boot
264K /config
5.0K /dev
212K /etc
0B /jail
0B /junosproc
16K /lib
4.0K /libexec
20M /mfs
4.0K /mnt
32K /modules
4.0K /mqtt_broker_re.pid
4.0K /oam
460K /opt
5.3G /packages
0B /proc
8.0K /root
12K /sbin
8.2M /tmp
1.4M /usr
du: /var/db/certs/common: Permission denied
du: /var/db/certs/system-key-pair: Permission denied
du: /var/db/certs/system-cert: Permission denied
du: /var/db/entropy: Permission denied
du: /var/db/fsad: Permission denied
du: /var/db/jdhcp_snoop: Permission denied
434M /var