docs: describe how OTel resource attributes are translated and stored in labels

[carsonip]

There are no docs describing how only a subset of OTel resource attributes are translated to ECS, and how the rest are converted, e.g. replacing . with _, and stored under labels.*. These pages are good candidates to describe this limitation.

• https://www.elastic.co/guide/en/observability/current/apm-open-telemetry-resource-attributes.html
• https://www.elastic.co/guide/en/observability/current/apm-open-telemetry-known-limitations.html

[harshithsaiv]

Hi @carsonip !

I would love to contribute to this. Can I give this a try? If possible, could you assign it to me?

Thanks!

[carsonip]

Thanks @harshithsaiv ! The docs are located in https://github.com/elastic/observability-docs . Let's proceed without adding an assignee to this issue first and let me know if you need any help.