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Enhanced Stellar Client Resilience and Observability #51

Description

@grantfox-oss

src/stellar.rs, src/config.rs, src/metrics.rs, src/rate_limit.rs, src/main.rs, src/cache.rs
Difficulty: Hard

Problem

The Stellar circuit breaker and retry logic lack full resilience patterns. No exponential backoff jitter, inadequate circuit breaker metrics, and no graceful degradation strategy.

Current Issues

  • Circuit breaker state transitions not fully atomic
  • Half-open state could accept unlimited concurrent calls
  • Retry jitter configuration ignored in calculations
  • No bulkhead pattern for resource isolation
  • Recovery procedure after circuit opens not documented
  • Timeout errors not differentiated from other failures

Required Changes

  1. Implement atomic state transitions using AtomicUsize
  2. Add semaphore-based concurrency limits for half-open state
  3. Implement full exponential backoff with jitter (Full, Equal, Decorrelated)
  4. Create bulkhead pattern with separate thread pools
  5. Add detailed metrics for each circuit state and transition
  6. Implement graceful degradation with fallback strategies

Acceptance Criteria

  • Circuit breaker passes resilience testing (chaos monkey compatible)
  • Exponential backoff reduces retries by 70% for cascading failures
  • Clear metrics for all state transitions
  • Recovery documentation with operational runbook

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GrantFox OSSIssue tracked in GrantFox OSSMaybe RewardedIssue may be eligible for a GrantFox rewardOfficial Campaign | FWC26Campaign: Official Campaign | FWC26bugSomething isn't workingenhancementNew feature or requestgood first issueGood for newcomershelp wantedExtra attention is needed

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