Tell me about telemetry and monitoring — what are they for and what have you worked with?

Telemetry and monitoring are needed for collecting, analyzing, and visualizing data about the application's and infrastructure's operation to detect problems promptly, optimize performance, and ensure stability.

In my practice, I have worked with monitoring systems based on Prometheus and Grafana. Using Prometheus, I collected metrics (such as request count, response time, memory and CPU usage), and used Grafana to build dashboards and alerts.

I also integrated request tracing with OpenTelemetry, which allowed me to see the call chain and quickly identify bottlenecks in distributed systems.

This approach helps maintain service quality and respond quickly to incidents.