systemd unit that's needed by multiple targets and stops when target stops - service

Question

I have a set of units that need to be run with multiple targets that come after multi-user.target.
Example:
multi-user.target <--> example1.target <--> example2.target <--> multi-use.target
Example target:
[Unit]
Description=Example target
Wants=multi-user.target
Requires=example.service
#PropagatesStopTo=example.service
Conflicts=rescue.service rescue.target
After=multi-user.target basic.target rescue.service rescue.target
Example service unit:
[Unit]
Description=Example unit
After=multi-user.target
Wants=multi-user.target
[Service]
Environment=Some Enviroment
ExecStart=Some Binary
Restart=on-failure
RestartSec=1
Type=simple
[Install]
WantedBy=example1.target example2.target
The main problem is when I try too stop the currently running target none of the Required units stop.
I've tried using PropagatesStopTo=example.service in the target with no success. Below is output:
/lib/systemd/system/example1.target:7: Unknown key name 'PropagatesStopTo' in section 'Unit', ignoring.
My systemd version is:
systemd 241 (241-166-g511646b+)
I know my systemd doesn't support PropagatesStopTo so I'm trying to find an alternative in my current systemd version.

Answer 1

You can add the below in the service file.
PartOf=example1.target
This adds a ConsistsOf dependency on the unit in the target.
From Systemd page
Configures dependencies similar to Requires=, but limited to stopping and restarting of units. When systemd stops or restarts the units listed here, the action is propagated to this unit. Note that this is a one-way dependency — changes to this unit do not affect the listed units.
When PartOf=b.service is used on a.service, this dependency will show
as ConsistsOf=a.service in property listing of b.service. ConsistsOf=
dependency cannot be specified directly.
Read more here