Sysyem limits for Confluence: reference?

Is there a page where we can look up system limits for Confluence Cloud?
For example we are interested on limits for https://developer.atlassian.com/cloud/confluence/rest/v1/api-group-user-properties/#api-wiki-rest-api-user-userid-property-key-post , where it is stated:

the number of properties which could be created per app in a tenant for each user might be restricted by fixed system limits.