What metrics do you track to assess the state and performance of services?

To evaluate the state and performance of services, the following metrics are usually tracked:

• Response time (Latency): how long it takes to process a request.
• Throughput: number of requests processed per unit time.
• Error rate: percentage or number of failed requests.
• Resource utilization:
  • CPU
  • Memory
  • Network
  • Disk
• Number of active connections or goroutines: helps understand the load.
• Application-specific metrics: e.g., number of processed tasks, queue status, etc.

In Go, tools like monitoring systems (Prometheus, Grafana) and built-in profilers (pprof) are often used for metrics collection.