This change creates an scheduler::limiter class which tracks and limits how many elections can be spawned. #4238
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… rate limiting is happening.
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The class is a facade around the active_transactions class and exposes a query scheduler::limiter::available to see if there is capacity available and a method scheduler::limiter::insert which checks for availability before inserting an election. Elections are inserted and tracked by the scheduler::limiter class. Coherency is maintained in a lazy manor by holding weak_ptrs to nano::elections and removing them if the pointer has expired or the election is no longer active as reported by active_transactions.
Previous discussion was on this branch #4133