`sig
type t = private Limiter.limiter
val create_exn :
now:Time.t ->
burst_size:int ->
sustained_rate_per_sec:float ->
max_concurrent_jobs:int -> Limiter.Throttled_rate_limiter.t
val try_start_job :
Limiter.Throttled_rate_limiter.t ->
now:Time.t ->
[ `Max_concurrent_jobs_running
| `Start
| `Unable_until_at_least of Time.t ]
val finish_job : Limiter.Throttled_rate_limiter.t -> now:Time.t -> unit
end`