What methods are used to identify the main cause of a microservice failure?

The main causes of failure in a microservice are identified by the following methods:

• Logging: analyzing service logs for errors and exceptions.
• Monitoring and metrics: checking CPU, memory, response time, and error indicators.
• Request tracing: tracking the request path through services to find bottlenecks.
• Reproducing the error: attempting to reproduce the failure in a test environment.
• Code and configuration analysis: reviewing changes that could have led to the failure.

Example: if a microservice suddenly starts responding with a 500 error, logs are first checked for that period, then load metrics are reviewed, followed by tracing to understand at which stage the failure occurs.