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To assess the state and performance of services, the following indicators are usually monitored:

• Response time (Latency): how long it takes to process a request.
• Throughput: number of requests processed per unit of time.
• Error rate: percentage or number of failed requests.
• Resource usage:
  • 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, metrics are often collected using monitoring tools (Prometheus, Grafana) and built-in profilers (pprof).