Backend tiers help you organize backend calls and present a more useful topological view of your application environment in flow maps. "Resolving" a backend to a tier means that the backend metrics are gathered into a tier. The tier may already exist in AppDynamics, or you can create a new one.
AppDynamics automatically resolves some backends to tiers. In general, those are custom backends or HTTP, RMI, Thrift or Web Services since they are usually on another instrumented node. If you want to see the backend on its own, you can "unresolve" it and it will appear on the flow map.
Resolve a Backend to a Tier to Change the Topological View
Even if a database is hosted on the same node as an instrumented app server, it may be displayed as a separate backend icon on the flow map. You may want to to resolve the database to the app server tier so that topologically, the representation is more intuitive for your environment.
Logical Backend Tiers for Homogeneous Backends
You can create a logical tier for a set of backends that are really the same, and resolve them to it. This can make sense visually, and give you more helpful metrics.
For example, if there appear to be multiple databases that are actually the same database using different namespaces, the default flow map is likely to display the databases separately. You can resolve the database backends to a new tier of type "Database Server" so they display as one and the tier metrics are together.
Resolving Backends to Tiers
If backends are not automatically resolved, you can resolve them in the UI.
Resolving a backend to a tier makes it no longer appear in the flow maps. Its traffic resolves to the tier.
You can resolve multiple backends to a tier. You also get tier-level metrics, so if a backend is taken out you still retain the historic data at the tier level.
To resolve a backend to a tier
- In a Remote Services or Databases Dashboard, click Action (lightning bolt) -> Resolve Backend to Tier.
- If the tier you want already exists, it will be listed and you can select it. Otherwise, select Create Tier.
- Enter a user-friendly name for the new tier.
- Select the Type from the pulldown menu.
- Click OK.
To see and configure backends associated with a tier
- In a Tier Dashboard, click Action (lightning bolt) -> Configure Backends Resolving to this Tier.
- Click a backend to see its properties.
You can delete the backend. Deleting the backend from the tier causes it to re-appear as an unresolved backend in the flow map.
You can resolve it to a different tier. Associating it with another tier causes traffic to it to resolve to the new tier.