How can I get the list of all users who logged into JIRA & confluence only in last 3 months.
Probably you could get such information into atlassian-jira-security.log. Perhaps it is better to use some parser.
a) What Daniil said. More info:https://answers.atlassian.com/questions/25660b) JIRA allows you to activate a detailed log of who accessed what.https://confluence.atlassian.com/jira/user-access-logging-121565.html
It looks like you're new here. Sign in or register to get started.