What is an SLI (Service Level Indicator)?

This is a quantitative indicator reflecting the level of service provided by the system. It measures a specific aspect of performance or reliability.

Examples of SLI:

• Percentage of successful HTTP requests
• Average API response time
• Error rate in message processing
• Service availability (uptime)
• System throughput

For example, for an API:

// Example of an SLI metric: Percentage of successful HTTP requests
// Metric: http_requests_total (counter)
// Labels: {status="2xx"}
// SLI will be calculated as: (number of successful requests) / (total number of requests)