How to determine the systemd service that called the bash script to be executed?

Question

bash

Hello, I've run into a small problem. The goal is to set the launch of a script in each of the necessary .service files for the OnFailure event, which will send a notification about the failure of a particular service through the telegram bot. But I ran into a problem, I can’t figure out how to determine in a bash script which service called this script, so that in the message from the bot I could indicate that this or that service has collapsed.

Answer 1

northernlightlabs.se/systemd.status.mail.on.unit.f...

Answer 2

cat /proc/$$/status|grep PPid | cut -f 2
get the pid of the parent process.
I don't know about the unit yet.
And who prevents the unit from running the script and passing it the required parameter?