Four golden signals.
also: golden signals · the four golden signals · RED method · USE method · RED and USELatency, traffic, errors and saturation, the four signals to watch for any service; RED (rate, errors, duration) covers request-driven ones.
the two-minute refresher
- Latency (split success and failure), traffic (demand), errors (rate of failures), saturation (how full).
- RED for services: request rate, error rate, duration.
- USE for resources: utilisation, saturation, errors (CPU, disks, queues).