Ktor 3: CallLogging and StatusPages don't have Trace IDs

[rolaca11]

Describe the bug

I have a Ktor 3 based project I want to use tracing with, but the CallLogging and StatusPages logs don't have tracing data included in them.

Steps to reproduce

Run a basic Ktor application with the module configuration like this:

fun Application.module() {
    // ...
    install(CallLogging) {
        level = Level.INFO
    }
    tracing() // details don't matter
    install(StatusPages) {
        exception<Throwable> {
            // ...
        }
    }
    // ...
}

Expected behavior

In case of a successful call (200 status), the log statements from CallLogging plugin should include tracing data.

In case of an error, log statements from the status page configuration should include tracing data as well.

Actual behavior

Neither of the above cases have tracing data in their log statements

Javaagent or library instrumentation version

io.opentelemetry.instrumentation:opentelemetry-ktor-3.0:2.12.0-alpha

Environment

JDK: Temurin 21
OS: Ubuntu 24.04

Additional context

I did a whole bunch of debugging and what I've noticed is that the io.opentelemetry.instrumentation.ktor.v2_0.common.internal.KtorServerTelemetryUtil#configureTelemetry function sets up tracing before the monitoring phase, which is way too late in the pipeline.

Both the above mentioned CallLogging and StatusPages plugins use hooks that run BEFORE the Monitoring and therefore the OpenTelemetry phases. In case of StatusPages, the hook used is CallFailed which intercepts the BeforeSetup phase.

I think, that tracing should start as early in the pipeline as possible, therefore I suggest inserting the OpenTelemetry phase before the BeforeSetup phase, or at least before the Setup phase (I realize BeforeSetup isn't guaranteed to exist).

[laurit]

We'd welcome a contribution for this.

[rolaca11]

Thank you, I made a PR.