mysql gaps scenario:

1. Take a backup
2. connect to the DB (replace DB_NAME and DB_NAMESPACE with your values):
kubectl exec -it DB_NAME-haproxy-0 -n everest -- mysql -u root -p -h DB_NAME-haproxy.DB_NAMESPACE
3. in the prompt, enter the password
4. add some data:
create database test;
5. mess up the logs:
  FLUSH BINARY LOGS;
  PURGE BINARY LOGS BEFORE now();
6. add some more data:
create database test1;
7. wait up to 1 minute
8. check the gaps /v1/namespaces/everest/database-clusters/mysql-bd9/pitr, they should be detected