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THE FEUTEX TOOLKIT

Canary Error Impact

Estimate total failed requests caused by a traffic-split rollout.

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01 Your input
02 Your result
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FormulaExpected failed requests = rate*sec*(share*bad+(100-share)*base)/10000; Blended error ratio = (share*bad+(100-share)*base)/100

Made for real tasks

  • Estimate total failed requests caused by a traffic-split rollout.
Explore step-by-step workflows →

Worked example

Inputs

Total request rate
1000 requests/s
Canary traffic share
5 %
Canary error ratio
20 %
Stable error ratio
0.1 %
Observation time
300 s

Expected results

Expected failed requests
3285 requests
Blended error ratio
1.095 %

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter total request rate, canary traffic share, canary error ratio, stable error ratio, observation time in the displayed units.
  2. Calculate the scenario, then compare it with measurements before changing a system.

Try this example

{
  "rate": 1000,
  "share": 5,
  "bad": 20,
  "base": 0.1,
  "sec": 300
}

Accuracy and scope

Weighted expectation; errors may be correlated and traffic populations may differ.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.