error: fields `ttl` and `stale_cache` are never read
 --> hitbox/src/policy.rs:3:5
  |
2 | pub struct EnabledCacheConfig {
  |            ------------------ fields in this struct
3 |     ttl: Option<u32>,
  |     ^^^
4 |     stale_cache: Option<u32>,
  |     ^^^^^^^^^^^
  |
  = note: `EnabledCacheConfig` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
  = note: `-D dead-code` implied by `-D warnings`