Usually no matter what issue you ran into, please run the sanity check and collect basic info firstly.

If you ran into etcdserver: mvcc: database space exceeded issue, or has a very big ${etcd-data-dir}/member/snap/db file, please follow How to debug large db size issue.

If you ran into performance issue, please follow How to debug performance issue.

Please let me know if anyone has any thoughts on how to improve this guide. Contribution is welcome!