[Darwin] OSLog: Historical logs show `<compose failure>`

[sureshg]

Env
kotlin-logging: 8.0.0-beta-01
Platform: macOS (Kotlin/Native)

When using DarwinLoggerFactory (default) on macOS, log messages are visible in live streaming but show <compose failure> when viewing historical logs.

• Live stream (works)

$ log stream --info --predicate 'senderImagePath ENDSWITH "macos.kexe"' --style syslog
2026-01-06 17:40:05.948564-0800  localhost macos.kexe[36525]: --> GET /media-api/images.json
2026-01-06 17:40:06.101296-0800  localhost macos.kexe[36525]: <-- 200 OK /media-api/images.json (153ms)
2026-01-06 17:40:06.102392-0800  localhost macos.kexe[36525]: --> GET /media-api/videos.json
2026-01-06 17:40:06.130684-0800  localhost macos.kexe[36525]: <-- 200 OK /media-api/videos.json (28ms)

• Historical logs (broken)

$ log show --last 5m --info --style syslog --predicate 'senderImagePath ENDSWITH "macos.kexe"'
2026-01-06 17:40:05.953183-0800  localhost macos.kexe[36525]: <compose failure [UUID]>
2026-01-06 17:40:06.105916-0800  localhost macos.kexe[36525]: <compose failure [UUID]>
2026-01-06 17:40:06.107011-0800  localhost macos.kexe[36525]: <compose failure [UUID]>
2026-01-06 17:40:06.135304-0800  localhost macos.kexe[36525]: <compose failure [UUID]>

AI says the following,

Apple's OSLog redacts dynamic content in persisted logs by default for privacy. The fix is to use the %{public}s format specifier when calling os_log, which marks the message content as safe to persist.

[sureshg]

I tried 8.0.0-beta-02, still having the same issue..not sure what's going on.

2026-01-08 09:58:30.401729-0800  localhost macos.kexe[44513]: <compose failure [UUID]>
2026-01-08 09:58:30.637967-0800  localhost macos.kexe[44513]: <compose failure [UUID]>
2026-01-08 09:58:30.639694-0800  localhost macos.kexe[44513]: <compose failure [UUID]>
2026-01-08 09:58:30.760384-0800  localhost macos.kexe[44513]: <compose failure [UUID]>

[oshai]

I have successfully reproduced the issue. The tests show <compose failure [UUID]> in the system logs, confirming that passing "%{public}s" from Kotlin directly does not satisfy os_log requirements (the format string must be in a specific static section of the binary).

I will create a C-interop fix.