API SLO and SLA

Latency percentiles rank API response times so you can read off the threshold below which most requests finish. p50 is the median, p95 leaves out the slowest five percent, and p99 captures the extreme tail that averages often hide but frequent users still hit.

Synthetic monitoring runs scripted HTTP requests on a schedule from distributed probe locations to measure API availability, latency, and correctness. Unlike passive logs, synthetics detect regressions before traffic spikes and validate SLO thresholds from vantage points that match user geography.

Real user monitoring (RUM) collects performance and error data from actual client sessions, such as navigation timing, fetch duration, and failed API calls in production apps. RUM complements synthetic probes by revealing device, network, and geography effects that lab tests never reproduce.

API failover is automatically redirecting traffic from a failing primary service to a healthy backup, such as a secondary region, an alternative provider, or a cached response. Failover keeps applications available when a dependency experiences an outage.

To cache zendesk api for customer status page, put a TTL cache on your RealComposer pipeline. Ticket counts cached with 60s TTL for status subdomain. Shared edge cache absorbs repeat traffic before it reaches Zendesk.

To solve stale while revalidate caching for third party rest apis, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.