are latency, traffic, errors, and saturation. If you can only measure four metrics of your user-facing system, focus on these four. http://landing.google.com/sre/book/chapters/monitoring-distributed-systems.html #elasticsearchjp
4. saturation ← How "full" your service is. (e.g., in a memory-constrained system, show memory; in an I/O-constrained system, show I/O) #elasticsearchjp
4. saturation ← How "full" your service is. (e.g., in a memory-constrained system, show memory; in an I/O-constrained system, show I/O) どれだけサービスがカツカツかを 示す指標 #elasticsearchjp