A looging provider is available but it logs exceptions into a text file (~/App_Data/sitefinity.log).
In case you want to log exceptions into the database, you should create your custom provider and add it in the web.config:
<add ... />
You can turn event logging on or off by changing the value of the healthMonitoring
property in your application web.config
|<healthMonitoring enabled="true" heartbeatInterval="0">
Hope this helps. Let us know if we can assist you with anything else in the future.
the Telerik team