Triage error spikes in AWS Application Signals services — error rate vs baseline, exception class clustering, log pattern detection via Logs Insights, top failing operations, and correlated deploys via CloudTrail. Trigger phrases: "error spike", "errors spiking", "5xx errors up", "4xx errors", "error rate increased", "exception spike", "failures up", "fault rate", "investigate errors", "error budget burning fast", "errors in service", "service throwing errors", "unhandled exceptions", "error cluster", "request failures", "API errors", "errors increased", "service erroring", or any request about diagnosing a sudden increase in errors.
