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Documentation on that can be found in https://github.com/input-output-hk/cardano-node/blob/master/doc/reference/configuring-a-node-using-yaml.md and https://github.com/input-output-hk/cardano-node/blob/master/doc/reference/cardano-governance.md.
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Stream
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The actual code implementing it is a little hard to find (as always with the quite convoluted and scarcely documented Haskell sources of IOG). I'd suspect it to be somewhere in https://github.com/input-output-hk/cardano-ledger/tree/master/eras.