Plugin head legends

Is there a document what is the meaning of node icon in plugin head ?

For 3 node cluster where all node are default which is master:true and
data:true
When you mouseover * it show master and for filled circle it shows worker
(which is I assume data node); but same time cat plugin shows * for *
and m for filled circle.
Does m in cat plugin is data node ?

Thanks,
Subodh

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