What is the style recommendation for offset on multi line annotations?

This is on a file/configuration with standard 2 space indents.

Google Java Format (2 space offset)
```
@Annotation(
string1 = "abcdefghijklmnopqrstuvwxyz",
string2 = "zyxwvutsrqponmlkjihgfedcba",
boolean1 = true
)
```

Checkstyle configured with google-checks (4 space offset)
```
@Annotation(
string1 = "abcdefghijklmnopqrstuvwxyz",
string2 = "zyxwvutsrqponmlkjihgfedcba",
boolean1 = true
)
```
It's quite possible [google_checks.xml](https://github.com/checkstyle/checkstyle/blob/master/src/main/resources/google_checks.xml) included with checkstyle doesn't configure this explicitly and it's just falling back to something else?

Just wondering what the *right* answer is here.