Module backoff 

Exponential backoff with jitter for supervisor restart strategies.

Implements the backoff algorithm described in the Janus Supervisor Architecture Refactor document:

delay = min(cap, base * 2^attempt) + jitter

Where jitter is a random value in [0, base * 2^attempt) to prevent thundering-herd scenarios when multiple services restart simultaneously after a shared outage.

Features

• Exponential growth with configurable base and cap
• Full jitter to desynchronize concurrent restarts
• Cooldown reset: if a service runs successfully for a configurable period, the attempt counter resets to zero so occasional rare failures don’t accumulate toward a long backoff
• Circuit breaker: if a service fails N times within a window T, the supervisor can escalate (e.g., shut down the node, fire an alert)

Structs

BackoffConfig

Configuration for the exponential backoff strategy.

BackoffState

Mutable state tracker for an individual service’s backoff history.

Enums

BackoffAction

Result of computing the next backoff delay.