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DevOps / AppDynamics Interview questions

How does the Cluster Agent monitor Kubernetes environments?

The Cluster Agent runs as its own pod inside a Kubernetes cluster and talks to the Kubernetes API server to collect cluster-level state and events — pod status, deployments, node conditions, and resource utilization — giving visibility into the orchestration layer itself, on top of whatever the in-process App Agents inside individual pods already report.

flowchart TD A[Kubernetes API Server] --> B[Cluster Agent Pod] B --> C[Controller] D[App Agent inside Pod 1] --> C E[App Agent inside Pod 2] --> C C --> F[Unified view: pod health + application transactions]

This split matters because App Agents alone can tell you a service is slow, but not why a pod was suddenly evicted, hit a memory limit, or failed a readiness probe; the Cluster Agent supplies that orchestration-layer context, so a transaction slowdown can be correlated with a pod restart or a node running low on allocatable resources happening at the same moment.

Together, the Cluster Agent's infrastructure view and the App Agent's transaction-level view let a team distinguish "the code got slower" from "Kubernetes is throttling or evicting the pods running the code," which are very different problems requiring very different fixes.

What does the Cluster Agent primarily connect to for cluster-level data?
What kind of problem can the Cluster Agent help distinguish from a pure code slowdown?

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Explain AppDynamics. What is Appdynamics? What is Application Performance Monitoring (APM)? What are agents and the controller in AppDynamics? What are the core components of the AppDynamics platform? Why is AppDynamics used? What is the Controller in AppDynamics? What is OpenTelemetry in Appdynamics? What is an App Agent in AppDynamics? What is Unified Monitoring in AppDynamics? What is a flow map in Appdynamics? What are the types of agents available in AppDynamics? What is a Business Transaction in AppDynamics? What is Appdynamics node? What is a Tier in AppDynamics? What is Galileo suite? What is a Node in AppDynamics? What is a Business Application in AppDynamics? What is the Application Flow Map? What is a Health Rule? What is a Policy in AppDynamics? What is a Transaction Snapshot? Define baseline in AppDynamics? What is the Machine Agent used for? What is End User Monitoring (EUM)? What is Database Visibility in AppDynamics? What are Backends in AppDynamics? Describe the Metric Browser in AppDynamics? What is the difference between a Tier and a Node in AppDynamics? How does AppDynamics automatically discover Business Transactions? What is the difference between automatic and custom Business Transaction match rules? How does AppDynamics correlate a transaction across multiple tiers? Why is the singularityheader important in transaction correlation? How does AppDynamics decide when to capture a transaction snapshot? What is dynamic baselining and how does it work? Why does the Java Agent use byte-code instrumentation? Explain the internal working of AppDynamics' byte-code instrumentation? What is a Service Endpoint in AppDynamics? What is an Information Point? What is a Data Collector in AppDynamics? When should you use custom match rules instead of automatic discovery? What is the difference between Slow, Very Slow, and Stalled transactions? How does AppDynamics calculate Average Response Time (ART)? What is the difference between the Machine Agent and the Network Agent? What is an Adaptive Session in AppDynamics? What is a thread dump and when does AppDynamics capture one automatically? How would you troubleshoot a suspected memory leak using AppDynamics? What are custom extensions for the Machine Agent? How does the Cluster Agent monitor Kubernetes environments? What is the difference between SaaS and On-Premises Controller deployments? How can you reduce AppDynamics agent overhead in a production environment? What is Business iQ / Analytics in AppDynamics? How does AppDynamics integrate with ITSM tools like ServiceNow or PagerDuty? What is the AppDynamics REST API used for? Explain the lifecycle of an alert from health rule violation to notification? What is the difference between Warning and Critical health rule severities? What are Instrumentation exclude rules and why would you use them? Explain the execution flow of a distributed transaction across microservices in AppDynamics?
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