older versions of puppet don't know about the --to_yaml option

[tuxmea]

switching back to scanning the result

fixes #118

[sathieu]

Thanks for this PR.

I have another error:

Error: Could not run: Could not find init script for 'alert_manager'

[tuxmea]

@sathieu next version with error handling. I am curious where the error is happening and whether the begin rescue block is helpful here.

[sathieu]

The rescue is not called because the error is in the puppet call.

This works:

Facter.add('prometheus_alert_manager_running') do
  setcode do
    Facter::Core::Execution.execute('puppet resource service alert_manager 2>&1').scan('running')[0]
  end
end

[bastelfreak]

Thanks for the PR!