DevOps / AppDynamics Interview questions
What is the Controller in AppDynamics?
The Controller is the central server that every AppDynamics agent reports to. It receives incoming metrics and transaction data, stores it, evaluates health rules against it in near real time, and serves the web UI and REST API that teams use to view dashboards, flow maps, and alerts.
It can run in two deployment modes: SaaS, where Cisco/Splunk hosts and manages the Controller for you, or on-premises, where the organization installs and operates it inside its own data center, typically for stricter data-residency or compliance requirements.
The Controller also owns configuration: health rule definitions, business transaction match rules, user access, and alerting policies are all authored and stored there, which is why losing Controller connectivity means agents keep collecting data locally but can't be centrally managed until connectivity resumes.
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