Write your query in Code mode

Your alert watches how often QuickPizza’s server fails. You want it to fire when more than 5 in every 100 requests fail.

You switch to Code and write PromQL so the full ratio is one clear expression.

What the query does:

• quickpizza_server_http_requests_total counts every request.
• rate(...[5m]) converts that count to a per-second rate over 5 minutes.
• {status=~"5.."} keeps only 5xx failures.
• Dividing failed by all requests, then multiplying by 100, gives a percentage.

1. Reopen New alert rule if installing QuickPizza redirected you away from the form.

2. Confirm Name is QuickPizza high error rate after reopening the form.

3. Choose grafanacloud-play-prom as the data source.

4. Select Code on the mode toggle.

5. Enter the error-rate query in Code:

   promql Copy

   100 * sum(rate(quickpizza_server_http_requests_total{status=~"5.."}[5m])) / sum(rate(quickpizza_server_http_requests_total[5m]))

6. Click Run queries.

The query reports QuickPizza’s error rate as a percentage. Next, you set the threshold and recovery while you’re still in this section.