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s0me0ne-unkn0wn authored
Currently, collators and their alongside nodes spin up a full-scale overseer running a bunch of subsystems that are not needed if the node is not a validator. That was considered to be harmless; however, we've got problems with unused subsystems getting stalled for a reason not currently known, resulting in the overseer exiting and bringing down the whole node. This PR aims to only run needed subsystems on such nodes, replacing the rest with `DummySubsystem`. It also enables collator-optimized availability recovery subsystem implementation. Partially solves #1730.