@markhnsn AFAIK, cluster is kind of subgraph. There is no clusters which are not a subgraph. So may be 'cluster' is an adjective?

Disclaimer: I am not a native language speaker. Fix me if I am wrong.

Yes, I think cluster is an adjective -- you can make a subgraph a cluster by starting its name with cluster_ or setting cluster=true attribute.

You can have subgraphs that are clusters, and subgraphs that aren't clusters.

So I'm treating the word 'cluster' here like an adjective, so it should go before the noun, like 'green apple' / 'cluster subgraph'.

But I think it's fair that if you're confused by this, probably some other people are too (it's fairly unusual and jargonney to use 'cluster' as an adjective I guess? except for 'cluster bomb'?), then maybe we should spell this out to help comprehension, something like

title: Cluster Attributes
descriptions: Attributes you can set on subgraphs that are clusters

or something like that

It could be either, but people seem confused, so more words are better and I’m in favor of Mark’s proposed title.

OK. Thank you.