> ## Documentation Index
> Fetch the complete documentation index at: https://docs.prefect.io/llms.txt
> Use this file to discover all available pages before exploring further.
# filters
# `prefect.logging.filters`
## Functions
### `redact_substr`
```python theme={null}
redact_substr(obj: Any, substr: str) -> Any
```
Redact a string from a potentially nested object.
**Args:**
* `obj`: The object to redact the string from
* `substr`: The string to redact.
**Returns:**
* The object with the API key redacted.
## Classes
### `ObfuscateApiKeyFilter`
A logging filter that obfuscates any string that matches the obfuscate\_string function.
**Methods:**
#### `filter`
```python theme={null}
filter(self, record: logging.LogRecord) -> bool
```