DevOps / AppDynamics Interview questions
What is the difference between a Tier and a Node in AppDynamics?
These two terms describe different levels of AppDynamics' monitoring hierarchy, and mixing them up is a common source of confusion for people new to the platform.
| Tier | Node |
| A logical group representing one application role (e.g. "Order Service"). | A single running instance of that application, e.g. one JVM. |
| Aggregates metrics across all its nodes. | Reports its own individual metrics to the tier. |
| Stays constant as you scale instances up or down. | A new node appears every time you add an instance. |
| Drawn as one box on the Application Flow Map. | Viewed individually inside the tier's node list. |
In practice, when you add a fourth server behind your load balancer for the same service, you get a fourth node under the same existing tier — you don't create a new tier for it.
What happens when you add a new instance behind a load balancer for an existing service?
Which one is drawn as a single box on the Application Flow Map?
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