Align returns a func to customize a PeriodLimit with alignment.

NewPeriodLimit returns a PeriodLimit with given parameters.

NewTokenLimiter returns a new TokenLimiter that allows events up to rate and permits bursts of at most burst tokens.

Allowed means allowed state.

HitQuota means this request exactly hit the quota.

OverQuota means passed the quota.

Unknown means not initialized state.

ErrUnknownCode is an error that represents unknown status code.

A TokenLimiter controls how frequently events are allowed to happen with in one second.