DevOps / AppDynamics Interview questions
What are Backends in AppDynamics?
A Backend is any downstream dependency a Business Transaction calls that AppDynamics doesn't have an agent installed on — a database, a cache like Redis, a message queue, a third-party REST API, or another internal service without its own App Agent.
AppDynamics detects these automatically as exit points: the moment the instrumented code makes a JDBC call, an HTTP call, or a call to a supported cache or messaging client, the agent records it as a backend call with its own response time and error rate, even though it can't see inside that dependency's own code.
Backends show up on the flow map as endpoint nodes at the edge of the diagram, and a slow backend is one of the most common root causes surfaced in a transaction snapshot — often the fix is on the backend side, but AppDynamics is what tells you to look there first.
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