[9.5] [Synthetics] Stop per-card maintenance-window refetch storm on overview scroll (#289776) - #291104
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…ew scroll (elastic#289776) ## Summary `useFetchMaintenanceWindows` had no `staleTime`, so react-query treated its cached result as stale immediately after every fetch. The hook is called per monitor card (`MetricItemIcon` -> `useMonitorMWs`) from the virtualized Synthetics overview grid, so scrolling — which constantly mounts fresh card instances as new rows come into view — fired a brand new `GET /internal/synthetics/monitors/maintenance_windows` request for every card, instead of reusing the one already-cached result. ## Fix Set `staleTime` to match the hook's existing `refetchInterval` (5 minutes) — the same window during which the data is already known to be safe to reuse (maintenance windows only take effect on a sync interval, and the existing `refetchInterval` comment explains why 5 minutes is the right cadence). This is a one-line change with no behavior change to the periodic background polling. ## Testing - Added a unit test (`use_fetch_maintenance_windows.test.ts`) asserting `staleTime` matches `refetchInterval`; confirmed red (fails without the fix) / green (passes with it). - Verified live: on the Synthetics overview page (card view), scrolling to load new pages of monitors previously fired one `maintenance_windows` request per newly-mounted card. After the fix, scrolling through newly-loaded pages triggers zero additional requests. ## Test plan - [x] Unit test added and passing - [x] Verified locally in a real browser (network trace before/after) - [x] `node scripts/eslint --fix` clean - [x] Scoped type-check clean (`synthetics` project full pass) (cherry picked from commit e443f81)
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💛 Build succeeded, but was flaky
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cc @shahzad31 |
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