What are the four golden signals of monitoring?

The Four Golden Signals are key metrics that help assess the state and performance of a system or service:

1. Latency — the response time of the system or service to a request. It is important to monitor not only the average time but also percentiles (e.g., 95th, 99th) to understand the quality of service.

2. Traffic — the number of requests or operations processed by the system per unit of time. It helps understand the load.

3. Errors — the number of failed requests or operations. An increase in errors may indicate problems in the system.

4. Saturation — the degree of resource utilization (CPU, memory, disk, network), indicating how close the system is to its maximum capacity.

These signals allow for quick identification and response to issues, ensuring the reliability and stability of services.