I got error "Percona exited with 10" when running Liquibase on my database.
I couldn't find the error message anywhere so adding this Q&A so that nobody else has zero search engine hits :)
My user didn't have permission to create a table.
The list of exit codes is here: https://www.percona.com/doc/percona-toolkit/3.0/pt-online-schema-change.html#exit-status