resilience-pattern-tuner

name	resilience-pattern-tuner
description	Tune DSDS resilience controls including retries, deadlines, circuit breakers, rate limits, bulkheads, and load shedding. Use when balancing availability, latency, and resource protection under failure and saturation conditions.

Resilience Pattern Tuner

Overview

Adjust resilience controls to reduce cascade risk without causing retry storms or unnecessary rejections. Produce configuration recommendations tied to measurable outcomes.

Workflow

1. Establish baseline behavior

• Record current latency, error, and queue metrics under normal and stressed loads.
• Identify whether failures are timeout-dominated, saturation-dominated, or dependency-dominated.

2. Tune timeout and retry chain

• Set bounded end-to-end deadlines.
• Tune retries with exponential backoff and jitter.
• Prevent retries from exceeding user-visible deadlines.

3. Tune isolation controls

• Configure circuit breaker thresholds and recovery windows.
• Configure bulkhead limits per critical path.
• Configure rate limits and load shedding policy.

4. Evaluate tradeoffs

• Measure changes in p99, error rate, and throughput.
• Check for side effects (false opens, early shedding, starvation).

5. Deliver tuning profile

• Provide settings, rationale, and expected impact.
• Include rollback conditions if regression appears.

Output format

1. Baseline issues
2. Proposed settings
3. Expected impact
4. Validation plan
5. Rollback criteria

References

• Read references/resilience-tuning-matrix.md for parameter heuristics.
• Use these repo sources:
• planning/IMPLEMENTATION_PLAN.md (Phase 5)
• docs/04-distributed-systems-and-failures.md (Chapter 24)
• canonical-catalogue/DSDS Canonical Catalogue - Patterns for scenario generation.csv