4.15 Release & Upgrade Notes

[yadvr]

• 4.15 systemvm upgrade steps
• 4.15 in conf.py for version
• 4.15 known issues boiler plate
• EOL for CentOS 6.x, MySQL 5.5, vSphere 6.0 (https://cwiki.apache.org/confluence/display/CLOUDSTACK/Hypervisor+and+Management+Server+OS+EOL+Dates)
• New support added for Ubuntu 20.04, CentOS/RHEL 8.x, XCP-ng 8.0/8.1, MySQL 8.0; browser versions updated
• UI deprecation/removal notice
• Check Primate related docs, repo/instructions wrt 1.0/GA

[yadvr]

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[yadvr]

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[yadvr]

@davidjumani can you update the section on Primate installation from CloudStack repo vs separately (both)

[davidjumani]

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[davidjumani]

@rhtyd Changes made. Could you please review ?

[yadvr]

LGTM thanks @davidjumani for the instructions fixes

@PaulAngus @DaanHoogland can you review and merge, what is remaining is still the list of issues fixes and known issues. Rest I think most of the sections are covered. cc @borisstoyanov @vladimirpetrov

[yadvr]

If there are no objections I'll merge this, any new changes can be submitted as new PR

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[DaanHoogland]

as you stated @rhtyd , we'll need addtional changes, but it doesn't matter if we add them here or in a new PR.