Does anyone know if there is a list of maximums for custom fields, custom statuses for workflow, number of projects?
There is no hard limit. But it is recommended to keep them in check because more the number of custom fields, projects, statuses etc, more the admin headache and performance overhead.
Checkout https://confluence.atlassian.com/display/ENTERPRISE/Scaling+JIRA#ScalingJIRA-ScalingasingleJIRAinstance
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