is there a way to tell if a cribl instance is configured as a worker or a leader, from the command-line?
```brandon@master:~/cribl/bin$ ./cribl status
Software Version: 4.0.2-5226fe62
Config Version: baf7bc9
you can also cat the `$CRIBL_HOME/local/_system/instance.yml` file to see the mode line.
a "mode=single" is a stand-alone instance?
technically all those are standalone since standalone is intended to mean any instance that isn't the Cribl App for Splunk