DevOps / AppDynamics Interview questions
Define baseline in AppDynamics?
A baseline is AppDynamics' learned model of "normal" performance for a specific metric — typically a Business Transaction's response time — built from historical data rather than a single fixed number a person has to guess and set.
Baselines are calculated per time window (for example, the same hour on the same day of the week), since traffic and normal latency often differ between a Tuesday morning and a Saturday night. Most default health rules compare the current value to the baseline using standard deviations, so a violation means "this is statistically unusual for this time," not just "this crossed an arbitrary line."
This matters because a fixed threshold either triggers constant false alarms during naturally busy periods or misses real problems during naturally quiet ones; a dynamic baseline adapts to that normal rhythm automatically.
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