Flag --check.ignore-group not working as expected

[mwalz0]

Nice tool. I am using it with default settings to scrape the rules of my Prometheus server at 0.0.0.0:9090, and check against them. I am trying to ignore a rule group, but it doesn't seem to respect my flag in the below format, and still outputs this rule group.

--check.ignore-group 'groupName'

I notice in the readme examples with this check.ignore-group, it also manually passes the --check.file. Does this ignore flag only work when passing a --check.file and not when the rules are scraped from the server?