docs/examples: add example on how setup sdk to get sdk metrics (#5449)

* docs/examples/metrics: add example on how to manually setup sdk for health metrics

* Add changelog

* Make it explicit that these are still in development

* Typo

* Fix external link syntax

* Apply suggestion from @emdneto

Co-authored-by: Emídio <9735060+emdneto@users.noreply.github.com>

* Precommit

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Co-authored-by: Lukas Hering <40302054+herin049@users.noreply.github.com>
Co-authored-by: Emídio <9735060+emdneto@users.noreply.github.com>