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World O1: The Control Room · Boss challenge

Pick the signals

You will learn: to choose SLIs, set an SLO and check the error budget for Kedai Kancil’s checkout.

Checked with Prometheus 3 on 1 Nov 2026

The problem

Boss: the owner of Kedai Kancil wants a promise for checkout, by today. Where do you start?

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Room 1: pick the SLIs for checkout. Swipe right for good ones.

Swipe right for good, left for needs work. Or use the buttons.

1 / 5

Share of checkouts that succeed

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Room 2: measure the first SLI. Good checkouts divided by all, at 30m.

Write good checkouts ÷ all checkouts, then Run.

Metrics in this data (tap to add):

Time 0 is when the data starts. The query looks back from the eval time.

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Room 3: pick the SLO for successful checkouts.

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Room 4: what calls a person, and what stays on a screen?

Drag a card into a box. Or tap the card, then tap the box.

      Try it

      Room 5: an outage started at 40m. How many checkouts failed by 60m?

      Subtract the good checkouts from all checkouts. Run it at 60m.

      Metrics in this data (tap to add):

      Time 0 is when the data starts. The query looks back from the eval time.

      Check

      120,000 checkouts by 60m. A 99.9% SLO allows 0.1% to fail: 120. You had 440. How much budget is used?

      Try it

      Final room, for real: write the promise down for an app you know.

      Real mission

      0 of 5 steps done · Your ticks are saved.

      You did it!

      You can now pick SLIs, set an SLO and check the error budget.