# Politica minima de managed service
Defina um servico validado e uma politica limitada de restart sem iniciar
threads.
```rust
use appcore_supervisor::{ManagedResource, RestartPolicy, ServiceDescriptor};
use std::error::Error;
use std::time::Duration;
fn main() -> Result<(), Box<dyn Error>> {
let policy = RestartPolicy::bounded(3, Duration::from_secs(60))?
.with_backoff(Duration::from_millis(200), Duration::from_millis(50))
.with_shutdown_timeout(Duration::from_secs(5));
let service = ServiceDescriptor::new("metrics", ManagedResource::Metrics, policy)?;
println!("{}: {:?}", service.name(), service.restart_policy().mode);
Ok(())
}
```
O descriptor fica imutavel depois da construcao. Nomes invalidos, orcamento de
restart zero e deadline de shutdown zero falham antes do lifecycle.