Opentelemetry - read baggage

[itziklavon]

Hi, are there any changes needs to be done to read the telemetry baggage?
so we would have full flow between services?

currently, if call comes to the server, from a different server which is also using opentelemetry, we cannot see this relation

thanks!

[mstrYoda]

Hi 👋

The middleware actually does context propagation: https://github.com/gofiber/contrib/blob/main/otelfiber/fiber.go#L100

Can you elaborate your issue?
Do you have any further info to reproduce to see your requirement?

[itziklavon]

In general, we have 2 applications
both of them monitored via opentelemetry
i have some calls between service A and service B

however, i don't see this full flow via the UI
i mean i do see the calls, from service A -> B
but service B parent trace is Null

might be issue with the way we configure the http client, but i'm not sure
any other configuration needed?
this is the way:

	httpClient.SetTimeout(10 * time.Second)
	httpClient.SetRetryCount(3)
	httpClient.SetTransport(otelhttp.NewTransport(new(RedirectChecker)))
	return httpClient

[mstrYoda]

Can you share screenshots?

It should be enough to add otel transport to your http client.

I can see in Jaeger that our applications propagates spans.

[itziklavon]

Hi, sure
for example:

Service A (gateway - Java based app):

Service B (goadmission - go-fiber based app):

it is not the same request(it is hard to find the exact request as i don't have anything to link them by), but all request to the path shows in service A going to service B, and it's parent context is null

service A on this case is java (using open telemetry agent)

other services, service A is nodejs and service B is java:

in here i see the call from service A (prerouter) to service B (koala-monolith)

[mstrYoda]

Are you sure about every service's HTTP clients add open telemetry span in their requests?

[itziklavon]

in this case i'm sure
for example the gateway app from previous example

different service, which uses java, does have the proper baggage