How did you initially understand the problem from the metric, and what did you do next?

First, I paid attention to the metric that deviated from the norm — for example, an increase in service response time or an increase in the number of errors.

Next, I analyzed logs and traces to localize the problem: to find out at which stage or component the delay or failure occurs.

Then, I checked the infrastructure status — CPU load, memory, network, database.

After identifying the cause (for example, a slow database query or a memory leak), I took measures: code optimization, resource tuning, scaling.

Iterativity is important: after making changes, I monitored the metrics again to ensure the problem was resolved.