Maybe we can set the requirement level to something

[trask]

Maybe we can set the requirement level to something
'conditionally_required: if instrumented technology supports different transports and value cannot be inferred from other attributes such as network.protocol.name'

This would eliminate the concern for ports and also would require instrumentations to populate it whenever it's helpful.

Originally posted by @lmolkova in #289 (comment)

[trask]

Removing from HTTP semconv stability project since HTTP semconv is already overriding network.transport to be conditionally required.

[trask]

Closing, I think we've come to consensus on not adding requirement levels in the attribute registry.