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>> Though I have too many questions, I'm in need of these since, Want to
>> understand the ROLE of metadata concept?
>
>
> The role is simple - you can set metadata on a server, and retrieve it later
> if you wish.

Let's say you're creating a web interface, like a dashboard, that
talks to the Compute API. You might want to let your users assign
"tags" to their servers like "LAMP" or "WAMP" or "production" or
"testarea" - metadata could be used for that use case.

Hope this helps.
Anne