why ttl == fill_time * 2

[The-Clover]

i guess
if ttl < fill_time, token will expired early
if ttl == fill_time, token will expired early when the network jitters

[The-Clover]

@spencergibb

[spencergibb]

It's from https://stripe.com/blog/rate-limiters and
https://gist.github.com/ptarjan/e38f45f2dfe601419ca3af937fff574d#file-1-check_request_rate_limiter-rb-L11-L34.

[spring-cloud-issues]

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