Add info and link about the Puma exporter
What does this MR do and why?
Describe in detail what your merge request does and why.
This MR includes information and links regarding the Puma exporter.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.