Add an Ox/direct-style-compatible OpenTelemetry tracing backend

[adamw]

Currently sttp-client only ships with OT+ZIO tracing integration.

The goal of the issue is to create a new module, opentelemetry-tracing-sync-backend, which will provide integration with blocking/direct-style OpenTelemetry tracing, as well as reference documentation showcasing how to use the module.

Moreover, a first step is to suggest a way of propagating the context (setting appropriate headers, including identifiers/correlation ids) that is compatible with virtual threads & scoped values, as used by Loom and Ox. Note that the the OT Java libraries often rely on ThreadLocals, which are not Loom-compatible.

See also softwaremill/tapir#4103

[adamw]

/bounty $750

[algora-pbc]

💎 $1,000 bounty • SoftwareMill

Steps to solve:

1. Start working: Comment /attempt #2314 with your implementation plan
2. Submit work: Create a pull request including /claim #2314 in the PR body to claim the bounty
3. Receive payment: 100% of the bounty is received 2-5 days post-reward. Make sure you are eligible for payouts

Thank you for contributing to softwaremill/sttp!

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Attempt	Started (GMT+0)	Solution
🔴 @varshith257	Nov 21, 2024, 1:50:35 PM	WIP
🔴 @stdthoth	Dec 6, 2024, 11:24:39 AM	WIP

[varshith257]

Once #2292 is done I will jump here to tackle this.

[adamw]

As we are getting first PRs for the bounties, I've published our "How to prepare a good PR" guide. I should have probably done this right away, sorry! :)

[stdthoth]

Hey @adamw is this still available ?

[varshith257]

@stdthoth it's in WIP. Will raise PR soon
I think I have to push a PR so that others know I am working on it but just a few things need a fix and will draft PR

[adamw]

@stdthoth as long as a PR isn't merged it is available - I've setup attempts (with /attempt) to time out after two weeks, that could provide some indication. @varshith257 I don't think you've attempted this issue?

Anyway, the first (good!) PR to get merged wins :)

[varshith257]

I haven't attempted due to algora bot limits the attempts and I haven't done this to make sure not make any messy with algora bot 😀

Anyway /attempt #2314

Algora profile	Completed bounties	Tech	Active attempts	Options
@varshith257	1 softwaremill bounty + 19 bounties from 9 projects	Rust, Scala, Go & more		Cancel attempt

[algora-pbc]

@varshith257: Reminder that in 7 days the bounty will become up for grabs, so please submit a pull request before then 🙏

[algora-pbc]

The bounty is up for grabs! Everyone is welcome to /attempt #2314 🙌

[stdthoth]

/attempt #2314

Algora profile	Completed bounties	Tech	Active attempts	Options
@stdthoth	1 bounty from 1 project			Cancel attempt

[algora-pbc]

@stdthoth: Reminder that in 7 days the bounty will become up for grabs, so please submit a pull request before then 🙏

[algora-pbc]

The bounty is up for grabs! Everyone is welcome to /attempt #2314 🙌