> ## Documentation Index
> Fetch the complete documentation index at: https://docs.restate.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Logging

> Suppress duplicate Python service logs during replay.

Restate may replay a handler after a suspension or retry. Calls to Python's standard logger run again during replay and can produce duplicate log entries.

## Replay-aware logger

Use `restate.getLogger()` inside your service code to create a standard Python logger with `RestateLoggingFilter` already attached:

```python {"CODE_LOAD::python/src/develop/logging.py#restate_logger"}  theme={null}
logger = restate.getLogger(__name__)


@service.handler()
async def greet(ctx: restate.Context, name: str) -> str:
    logger.info("Processing greeting for %s", name)
    return f"Hello, {name}!"
```

The filter suppresses records emitted while Restate is replaying the handler. Logs from the first execution attempt and logs emitted outside a Restate invocation are unaffected. Configure handlers, formatters, destinations, and log levels with Python's standard [`logging`](https://docs.python.org/3/library/logging.html) APIs.

## Add the replay filter to an existing logger

If your application or framework already creates its loggers, attach `RestateLoggingFilter` directly:

```python {"CODE_LOAD::python/src/develop/logging.py#logging_filter"}  theme={null}
standard_logger = logging.getLogger("my-application")
standard_logger.addFilter(restate.RestateLoggingFilter())
```

Add the filter to every logger whose handler logs should be suppressed during replay.