package membership

import "errors"

// ErrLobbyUnavailable signals that a Resolve call could not be completed
// because the upstream Lobby service was unreachable. The cache wraps
// `ports.ErrLobbyUnavailable` returned by the LobbyClient adapter; hot-path
// services map this sentinel to `service_unavailable`.
//
// Callers branch with errors.Is. Returned only on cache miss / TTL expiry
// when the Lobby fetch fails; cached entries are served regardless of
// upstream availability until the TTL elapses.
var ErrLobbyUnavailable = errors.New("membership cache: lobby unavailable")