template for a systemd service that logs a failed invocation to /home/asdf/alerts/%N-failure

example.service

[Unit]
Description=my service

[Service]
Restart=always
RestartSec=10
ExecStart=
Environment="ALERT_PATH=/home/asdf/%N-failure"
ExecStopPost=/bin/bash -c '\
    echo $$SERVICE_RESULT, $$EXIT_CODE, $$EXIT_STATUS | logger; \
    if [ "$$SERVICE_RESULT" != "success" ]; then \
        sudo -u asdf touch "$$ALERT_PATH"; \
        journalctl -u %n _SYSTEMD_INVOCATION_ID=$$INVOCATION_ID > "$$ALERT_PATH"; \
    fi \
'