DevOps / AppDynamics Interview questions
What is Application Performance Monitoring (APM)?
Application Performance Monitoring is the practice of measuring and analyzing how well software performs while it's actually running, so teams can detect slowdowns, errors, and capacity problems before — or as soon as — they affect users.
A typical APM tool like AppDynamics tracks a core set of signals for every request: response time, throughput (calls per minute), and error rate, then correlates those signals with the underlying code path, database calls, and infrastructure the request touched.
What separates APM from plain infrastructure monitoring is the code-level and transaction-level view: instead of just knowing a server's CPU spiked, APM tells you which business transaction, method, or SQL query caused it, which is what makes root-cause analysis fast instead of a guessing game across dashboards.
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