What is the max number of engines supported in a cluster?

Hi,

I couldn't find the answer in the docs so asking here.
What is the max number of engines I can run simultaneously in my cluster?
I don't mean in one server, but in the entire cluster.

Thanks.

The issue names no files, tests, or entry points; begin by locating the existing cluster and engine-capacity documentation. Confirm the maximum simultaneous engines for an entire cluster, then document that answer and any stated qualifications.

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