Query interface for a Legion agent activity tracker.

An implementation provides the dashboard's read model for agents and their events. The configured tracker is supervised by LegionWeb and called directly by the dashboard.

Built-in trackers

• LegionWeb.AgentTracker.Telemetry is the default. It keeps recent agents and events in memory from Legion telemetry.
• LegionWeb.AgentTracker.Postgres rebuilds the dashboard from a PostgreSQL-backed Legion.Store and follows changes through database notifications.

The telemetry tracker needs no configuration. To select another tracker, configure its module and startup options:

config :legion_web, :agent_tracker,
  {LegionWeb.AgentTracker.Postgres, store: MyApp.AgentStore}

A custom tracker must implement this behavior and provide a child specification so LegionWeb can supervise it. Implementations may use any process model, storage mechanism, or ingestion strategy as long as they return the records described by this interface.