Ability to see number of projects, tickets, workflows in Cloud Instance

Some of the following information is available easily in Data Centre's System Info, but it is not easily found in Cloud instances:

• Number of projects (All projects, Team-managed/Next-gen projects, and JSM projects)
• Number of issues
• Number of workflows
• Number of comments
• Number of Custom fields
• List of apps/plugins
• Attachment size

Workaround

• Go to https://<your site name>.atlassian.net/jira/settings/system/migration/home to see a partial list:
  

• Number of projects (All projects, Team-managed/Next-gen projects, and JSM projects)
  https://community.atlassian.com/t5/Jira-questions/How-many-projects-do-we-have/qaq-p/1591954
  The endpoint https://<site name>.atlassian.net/rest/api/3/search returns a Total field which tells you the total number of projects.
  Note: If the project contains the key-value pair simplified:true, that means it is Team Managed.

• Number of issues
  https://community.atlassian.com/t5/Jira-questions/How-to-get-all-issues-in-jira-using-rest-api/qaq-p/826281
  https://<site name>.atlassian.net/rest/api/3/search returns a Total field which tells you the total number of issues.

• Number of workflows
  https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-workflows/#api-rest-api-3-workflow-search-get
  https://<site name>.atlassian.net/rest/api/3/workflow/search returns a Total field which tells you the total number of issues.

• Number of comments
  Number of comments: This one is not available out of the box, but you can use our REST API to retrieve the comments for each issue: https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-comments/#api-rest-api-3-issue-issueidorkey-comment-get
  This endpoint does not return a Total field

• Number of Custom fields
  https://community.developer.atlassian.com/t/jira-cloud-rest-api-for-next-gen-projects-fetching-all-custom-fields-for-specific-projects/41994
  https://<site name>.atlassian.net/rest/api/3/field

• List of apps/plugins
  Not exportable - must be copy-pasted from the UI: https://<your site name>.atlassian.net/plugins/servlet/upm