---
title: Event Logging
sidebar_position: 9
version: 1
---

# Logging

## Event Logging

Superset by default logs special action events in its internal database (DBEventLogger). These logs can be accessed
on the UI by navigating to **Security > Action Log**. You can freely customize these logs by
implementing your own event log class.
**When custom log class is enabled DBEventLogger is disabled and logs
stop being populated in UI logs view.**
To achieve both, custom log class should extend built-in DBEventLogger log class.

Here's an example of a simple JSON-to-stdout class:

```python
    def log(self, user_id, action, *args, **kwargs):
        records = kwargs.get('records', list())
        dashboard_id = kwargs.get('dashboard_id')
        slice_id = kwargs.get('slice_id')
        duration_ms = kwargs.get('duration_ms')
        referrer = kwargs.get('referrer')

        for record in records:
            log = dict(
                action=action,
                json=record,
                dashboard_id=dashboard_id,
                slice_id=slice_id,
                duration_ms=duration_ms,
                referrer=referrer,
                user_id=user_id
            )
            print(json.dumps(log))
```

End by updating your config to pass in an instance of the logger you want to use:

```
EVENT_LOGGER = JSONStdOutEventLogger()
```

## StatsD Logging

Superset can be configured to log events to [StatsD](https://github.com/statsd/statsd)
if desired. Most endpoints hit are logged as
well as key events like query start and end in SQL Lab.

To setup StatsD logging, it’s a matter of configuring the logger in your `superset_config.py`.
If not already present, you need to ensure that the `statsd`-package is installed in Superset's python environment.

```python
from superset.stats_logger import StatsdStatsLogger
STATS_LOGGER = StatsdStatsLogger(host='localhost', port=8125, prefix='superset')
```

Note that it’s also possible to implement your own logger by deriving
`superset.stats_logger.BaseStatsLogger`.