dear,
im the only one who knows the admin password in jira, and im sure i didnt use it the whole day but i can see that the last login is today, how come ??
Do you have any background tasks that run such as integrations with your source controll system? If so, check to see which username they are using.
In any case, change your password, turn on login logging and see what is going on or what starts to fail.
Do you have any third party interfaces, streams or feeds that interface with your Jira instance? Some examples are activity streams, Zephyr, EazyBI, etc.
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