How to calculate the stability indicator of a system?

The system resilience indicator is a metric that reflects the system's ability to maintain operability and function correctly under external or internal failures.

In the context of PHP and web applications, resilience can be assessed through parameters such as:

• Uptime
• Number of requests processed without errors
• Percentage of successful operations
• Recovery time after a failure

To calculate, a simple formula can be used, for example, to estimate uptime:

$uptime = ($faultless_time / $total_observation_time) * 100; // in percentage

Where $faultless_time is the time when the system was functioning correctly, and $total_observation_time is the total monitoring period.

Thus, the resilience indicator is a comprehensive characteristic that can be measured in different ways depending on the system's specifics.