You can use audit logs to find the user who deleted apps or records.
To do so, you need to have cybozu.cn administrative permission.

To check the audit logs, follow the steps below.

1. Click the Settings icon (the gear-shaped icon) at the top of kintone, then click Users & system administration.
   

2. Click View & Download under Audit Logs.

3. Set the following filter conditions:

   • From Date & Time and To Date & Time
     Specify a date range for your search.
   • Action
     To find the user who deleted an app, enter "App delete". To find the user who deleted a record, enter "Record delete".

4. Click View.