Wrong distributed headers injection env var is used

[jumbosushi]

I'm finding two permutations of DD_PROPAGATION_STYLE_INJECT string being used throughout the documentation and the code:
A. DD_PROPAGATION_STYLE_INJECT
B. DD_PROPAGATION_INJECT_STYLE

From the Ruby documentation, I expected this library to parse the environment variable in permutation A. However, this library uses permutation B.

Go documentation mentions the use of permutation A which is consistent with the dd-trace-go source code

What do you think about updating the code to use permutation A (that'll be consistent with the documentation and other languages)?

extraction env var uses the wrong ordering as well.

[marcotc]

👋, thank you reporting this issue.

Our documentation is definitely mismatched with our implementation. I believe the correct course of action is to move Ruby to move to DD_PROPAGATION_STYLE_INJECT instead.

I'll double check with our team to find out what the desired environment variable name is.

[marcotc]

👋 @jumbosushi, we've shipped a fix for this issue in 0.43.0. I'm closing this issue as done.

Please let us now if you still have any feedback on it.