Bug in LLM Usage UI

zogstrip · January 6, 2026, 11:05am

Nice catch @RBoy - I missed handling/clearing the cache when changing the period as well

github.com/discourse/discourse

FIX: Update model/feature dropdowns when changing time period in AI usage

main ← fix/ai-usage-dropdown-cache

merged 07:12AM - 07 Jan 26 UTC

ZogStriP

+91 -90

Follow-up to a1cc09d22d. The model and feature dropdown lists in the AI Usage… admin page weren't updating when users changed the time period. For example, switching from "Last month" to "Last 24 hours" would still show models that had no usage in the last 24 hours. The root cause was a race condition in the caching mechanism. The cache was being cleared inside the async `fetchData` method, but tracked property changes in methods like `setPeriodDates` would trigger Glimmer re-renders before the cache was cleared. This caused the stale cached values to be used during re-render. Additionally, the cache could be populated with empty arrays during initial render before the AJAX response arrived, preventing proper population once data was available. The fix moves cache invalidation to happen synchronously before any tracked property changes, and only populates the cache when actual data is present. This ensures the dropdown options always reflect the currently selected time period. Ref - https://meta.discourse.org/t/bug-in-llm-usage-ui/392652

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Bug in LLM Usage UI

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