Sleep sleeps for the duration t and can be interrupted by ctx.

Default is the default backoff policy to use.

FiveSec is a backoff policy ranging up to 5 seconds.

FiveSecStartGrace Like FiveSec but allows for a few fairly rapid initial tries.

TwentySec is a backoff policy ranging up to 20 seconds.

TwoMinutesSlowStart is a backoff policy ranging from 6 seconds to 120 seconds over 18 intervals.

Policy implements a backoff policy, randomizing its delays and saturating at the final value in Millis.