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# Deploy JSON backend для `library/cpp/logger`
Пишет логи в [формате Yandex Deploy](https://deploy.yandex-team.ru/docs/logs/format)
(JSON-строки для Unified Agent / Monitoring).
Аналоги: Python `library/python/deploy_formatter`, Go `library/go/core/log/zap`
(`NewDeployLogger`), TypeScript `yandex-logger` (deploy stream).
## Использование
```cpp
#include <library/cpp/logger/deploy/backend.h>
#include <library/cpp/logger/log.h>
#include <library/cpp/logger/stream.h>
TLog log(MakeHolder<TDeployJsonLogBackend>(
MakeHolder<TStreamLogBackend>(&Cout),
"my-service"));
TLogElement(&log, TLOG_INFO)
.With("request_id", "abc")
.With("code", "200")
<< "hello";
```
```json
{"@timestamp":"...","levelStr":"INFO","message":"hello","loggerName":"my-service","request_id":"abc","@fields":{"code":"200"}}
```
`loggerName` задаётся в конструкторе. Через `With(...)` в корень JSON попадают
`request_id`, `user_id`, `stackTrace`, `threadName`; остальное — в `@fields`.
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