Target Discovery Adapter

Discovery adapters provide the list of available backend servers with metadata (identifier, address, type, player count, region, etc.).

Fixed Adapter

Static server list from configuration.

[target_discovery]
adapter = "fixed"

[[target_discovery.fixed.targets]]
identifier = "hub-1"
address = "10.0.1.10:25565"
meta = { type = "hub", players = "0" }

[[target_discovery.fixed.targets]]
identifier = "survival-1"
address = "10.0.2.10:25565"
meta = { type = "survival", players = "0" }

Metadata: Used by strategy adapters for selection. Common fields: type, region, players, capacity.

gRPC Adapter

Custom gRPC service for dynamic discovery.

[target_discovery]
adapter = "grpc"

[target_discovery.grpc]
address = "http://discovery-service:3030"

See Custom gRPC Adapters for implementation details and proto definitions.

Agones Adapter

Auto-discovers game servers in a Kubernetes cluster using Agones.

[target_discovery]
adapter = "agones"

[target_discovery.agones]
namespace = "minecraft"
label_selector = "game=minecraft,type=lobby"  # Optional

Watches for Agones GameServer resources in the namespace, extracts metadata from labels, annotations, and counters.

RBAC: Requires get, list, watch permissions on gameservers resource. See Kubernetes Guide.