API Reliability & Latency Optimization
Understand how serving topology, cache rates, and hardware tiers affect latency, reliability, and cost so teams can meet SLAs within budget.
KPIs
Availability
Share of successful requests over the window.
Higher is better
Latency P95
95th percentile end‑to‑end latency.
Higher is worse
Latency P99
99th percentile end‑to‑end latency.
Higher is worse
Error Rate
Fraction of requests returning 4xx/5xx (server‑side classified).
Higher is worse
Timeout Rate
Share of requests exceeding timeout budget.
Higher is worse
Cost per Request
Estimated variable infra cost per request.
Higher is worse
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USD (millions)
SLO Compliance Rate
Fraction of requests meeting the Service Level Objective (SLO) target (latency+availability).
Higher is better
Error Budget Burn Rate
Rate of consuming the allowed Service Level Objective (SLO) error budget.
Higher is worse
Requests Over Latency SLO Share
Share of requests exceeding the latency Service Level Objective (SLO) threshold.
Higher is worse
Reliability Index
Composite 0–1 index combining availability, error rate, and timeout rate.
Higher is better
Internal Factors
Cache Hit Ratio
Share of requests served from cache.
Higher is better
Queue Depth
Number of requests waiting in internal queues.
Higher is worse
Retry Share
Fraction of requests that are retries (client or server initiated).
Higher is worse
Throttling Rate
Fraction of requests rejected due to rate limits/quotas.
Higher is worse
Quota Utilization
Share of consumed quota against allowed budget.
Higher is worse
Instance Saturation
Average utilization of serving instances.
Higher is worse
Cold Start Rate
Share of requests impacted by cold starts.
Higher is worse
Upstream Dependency Latency P95
95th percentile latency of critical upstream calls.
Higher is worse
Upstream Dependency Error Rate
Fraction of upstream calls that fail.
Higher is worse
Region Traffic Imbalance Index
0–1 index of how concentrated traffic is across regions (1=worse imbalance).
Higher is worse
Regulated Traffic Share
Share of requests constrained by compliance/sovereignty to specific regions.
Higher is worse
Request Rate (RPS)
Average requests per second (RPS) during the window.
Levers
Cache TTL (s)
Time‑to‑live for cacheable responses.
Batching Window (ms)
Time window to aggregate requests for batch processing.
Retry Policy — Max Attempts
Maximum retry attempts per request.
Request Timeout (s)
Timeout budget for a request at the gateway/service.
Concurrency Limit per Instance
Max concurrent requests each instance will accept.
Autoscaling Target Utilization
Utilization target for the autoscaler (e.g., HPA).
Routing Policy
Policy used by traffic manager to choose regions/paths.
Failover Policy
Rules for failover between regions/providers.
Circuit Breaker — Error Rate Threshold
Error‑rate threshold to open circuit.