Procstat select pid of systemd service

[phemmer]

Feature Request

Opening a feature request kicks off a discussion.

Proposal:

The procstat input should be able to identify the process to monitor by using the systemd service

Current behavior:

Can only match processes by pidfile, exe, pattern, or user.

Desired behavior:

Match process by specifying systemd service name.
systemctl status foo.service provides a Main PID value. This is the value that should be tracked.
Optionally, it might be nice to include any descendent PIDs as well.

Use case: [Why is this important (helps with prioritizing requests)]

Sometimes it might be difficult or impossible to identify a specific process by using the existing matching patterns. Using the systemd service PID could make it easy to identify these.