Read the original README to get the details about this gem. Here we will list only the diffrerences with the original gem.

You can sample your requests by setting the ENV variable APPSIGNAL_SAMPLING_RATE. A value of 1 (the default) means that all requests will be recorded in Appsignal. A value of 0.5 means that only 50% of the requests will be recorded. A value of 0.01 means that only 1% of the requests will be recorded.

This does not include errors. If an error occurs during a transaction, it will always be recorded.

This will mess up your statistics on Appsignal of course.