Implement tracing dual-write for KAS
The goal of this MR is to make KAS write traces to both the old observability stack (i.e. Jaeger-based) and the new one (Gitlab-UI based).
We are still working on getting Gitlab-UI on par with Jaeger when it comes to functionality. Having KAS data in the new system would allow us to dogfood our ingestion infrastructure and fine-tune it, and additionally let people testing the new UI use their own data instead of some auto-generated one which could provide better insights.
Once this MR gets merged, I will create a follow-up for the infra repo for gstg and gprd.
Related to gitlab-org/opstrace/opstrace#2514 (closed)
Edited by Pawel Rozlach