### 17.4 P3 — 프로파일 검증기가 javadoc 이 든 두 실수 중 하나만 검사한다

javadoc:

> "Two in particular. Round-robin over a target that resolves to one address … and **two profiles
> pointing at the same target with the same settings are one channel with two names**, which is the
> shape that appears when somebody wanted a different SLO and copied the profile instead."

구현된 것은 첫째와 **다른 것**이다.

```java
String previous = seenNames.putIfAbsent(profileName, profile.target().toString());
if (previous != null) { violations.add("channel profile '…' is declared twice, for '…' and '…'"); }
```