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MPI Routing not distributing traffic according to configuration ratio — anyone having the same issue?

Greetings everyone,

I am carrying out tests on the traffic distribution feature available on Mlytics, and among others, I have already defined the CDN split ratio very coherent, e.g., 70% to provider A and 30% to provider B. However, when comparing the actual results with an external tool, the results are surprisingly different from the configuration.

I did a check on the rule, region, and update time. All are correctly saved on the dashboard, but the Poly Track reality is that the operation is not in line with what is supposed to be.

So I am asking everyone for their experiences:

What is the delay for the routing update to be applied to the end-user?

Are there any conditions (like a health check, latency spike, or auto-fallback) that might cause MPI to override the configuration and automatically adjust the ratio?

Can you verify the routing decision logs or recordings to find out how each request is being distributed?

What method would you recommend to accurately measure the exact ratio if you would like to conduct testing?

I want to learn about the actual operating mechanism so that I can tune the system to be more reliable and stable. I look forward to sharing with those who have already implemented it.

I really appreciate it!