Add Jaeger remote sampler

[yvrhdn]

Add an implemention of the Jaeger remote sampler as described in the SDK spec, added by open-telemetry/opentelemetry-specification#1791.

Not yet implemented:

• the rate limiting strategy
• logic to parse the OTEL_TRACES_SAMPLER_ARG environment variable

Closes open-telemetry/opentelemetry-go#2148
Closes open-telemetry/opentelemetry-go#327

[joe-elliott]

@pavolloffay were/are you working on this?

[pavolloffay]

For java not for golang

[matej-g]

@kvrhdn What's the status of this? Anything I could help with? I was looking to implement this myself and stumbled upon this PR.

[yurishkuro]

@joe-elliott fyi

[yvrhdn]

@kvrhdn What's the status of this? Anything I could help with? I was looking to implement this myself and stumbled upon this PR.

Honestly, I kind of lost track of this PR as my priorities changed. Checking my work again this is in pretty okay spot I think. IIRC I just wanted to implement the rate limiting strategy before opening it up for review, but how the sampler is supposed to work was a bit unclear (there is no documentation on each strategy AFAIK).

I see I still have pending comments with questions that are 3 months old now lol 🙃

I can spend some time tomorrow to get this PR updated and open it for reviews. This should allows us to move forward with this sampler.

[dino-ma]

These problems you mentioned should have been fixed now. Please run CI again.
Thank you for your guidance.

About flow control, I think the original author refers to your scheme. I don't think much about how to optimize it here.
https://github.com/jaegertracing/jaeger-client-go/blob/master/utils/rate_limiter.go

@yurishkuro

Please help cr. if there is no problem, please approve the integration and release a new version. This version is very important to me.
@dashpole @MadVikingGod @pellared @MrAlias @evantorrie @paivagustavo @XSAM

[dino-ma]

Can you label it for me, because if you don't label it, CI can't get through. But I don't have this permission to tag. Thank you very much!

go.opentelemetry.io/contrib/samplers/jaegerremote/v0.22.0

https://github.com/open-telemetry/opentelemetry-go-contrib/runs/5465487196?check_suite_focus=true#step:7:458

@yurishkuro

[Aneurysm9]

You need to add replace statements to cause it to use a local copy of the module. See other examples for examples.

[dino-ma]

You need to add replace statements to cause it to use a local copy of the module. See other examples for examples.

I did this before, but other students asked me to modify it. Now that I've changed it, please run CI. Thank you

@Aneurysm9

[dino-ma]

I would like to ask when this PR can be integrated and released? I need it urgently. Thank you.
@yurishkuro

[yurishkuro]

I approved it, but I'm not a maintainer of this repo.

[dino-ma]

I approved it, but I'm not a maintainer of this repo.

Thank you very much.

By the way, I also want to ask whether otel can support W3C and Zipkin's B3 propagation at the same time. What should I do?

Style guide conformity concerns have been addressed.

[jmacd]

Thank you @kvrhdn 🎉

[yurishkuro]

🥳 🥳 🥳

[dino-ma]

Thank you very much.