| LogAdapterInterface | Adapter class that allows Guzzle to log data to various logging implementations. |
| AbstractLogAdapter | Adapter class that allows Guzzle to log data using various logging implementations |
| ArrayLogAdapter | Stores all log messages in an array |
| ClosureLogAdapter | Logs messages using Closures. Closures combined with filtering can trigger application events based on log messages. |
| MessageFormatter | Message formatter used in various places in the framework |
| MonologLogAdapter | Adapter class that allows Guzzle to log data using various logging implementations |
| PsrLogAdapter | PSR-3 log adapter |
| Zf1LogAdapter | Adapts a Zend Framework 1 logger object |
| Zf2LogAdapter | Adapts a Zend Framework 2 logger object |