DGUK-60: Update traffic alert threshold to 25 req/s rightsized capacity#4249
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amar-gds-ndl wants to merge 1 commit into
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DGUK-60: Update traffic alert threshold to 25 req/s rightsized capacity#4249amar-gds-ndl wants to merge 1 commit into
amar-gds-ndl wants to merge 1 commit into
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Lower DataGovUkHighTrafficRate alert threshold from 44.6 to 20.0 req/s to reflect the rightsized capacity target of 25 req/s. Previous: 80% of 55.8 req/s (100 VU load test) = 44.6 req/s Updated: 80% of 25 req/s (rightsized, 45 VU load test) = 20.0 req/s Update unit tests to match new threshold and description.
jasonBirchall
approved these changes
May 11, 2026
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Summary
Updates the
DataGovUkHighTrafficRatePrometheus alert to reflect the rightsized capacity target of 25 req/s (down from the previous 55.8 req/s established at 100 VUs).Paired with alphagov/govuk-dgu-charts#722 which reduces resource allocations and load test VUs on staging.
Changes
Alert rule (
rules/datagovuk_traffic.yaml)Alert unit tests (
rules/datagovuk_traffic_tests.yaml)promtool test rules datagovuk_traffic_tests.yamlThreshold calculation