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[Unit]
Description=Send a notification OnFailure of another service. Declare 'OnFailure=ntfy-failure@%i.service' in another service and set NTFY_TOPIC in an override of this service.

[Service]
Type=oneshot
Environment=NTFY_URL=https://ntfy.sh
Environment=NTFY_TOPIC=
# see https://docs.ntfy.sh/emojis/
Environment=NTFY_TAGS="warning"
# limit to less than 4096 to prevent turning the message into an attachment: https://docs.ntfy.sh/publish/#limitations
ExecStart=/usr/bin/sh -c 'curl -H "Tags: $NTFY_TAGS" -H "Firebase: no" -d "[%u@%H] Service %i failed\n$(journalctl --unit %i --lines 5 --reverse --no-pager --boot | head -c 4095)" $NTFY_URL/$NTFY_TOPIC'
#ExecStart=/usr/bin/sh -c 'curl -H "Tags: $NTFY_TAGS" -H "Firebase: no" -d "[%u@%H] Service %i failed\n$(journalctl --user --unit %i --lines 5 --reverse --no-pager --boot | head -c 4095)" $NTFY_URL/$NTFY_TOPIC'