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https://linear.app/unleash/issue/2-3406/hold-unknown-flags-in-memory-and-show-them-in-the-ui-somehow This PR introduces a suggestion for a “unknown flags” feature. When clients report metrics for flags that don’t exist in Unleash (e.g. due to typos), we now track a limited set of these unknown flag names along with the appnames that reported them. The goal is to help users identify and clean up incorrect flag usage across their apps. We store up to 10 unknown flag + appName combinations, keeping only the most recent reports. Data is collected in-memory and flushed periodically to the DB, with deduplication and merging to ensure we don’t exceed the cap even across pods. We were especially careful to make this implementation defensive, as unknown flags could be reported in very high volumes. Writes are batched, deduplicated, and hard-capped to avoid DB pressure. No UI has been added yet — this is backend-only for now and intended as a step toward better visibility into client misconfigurations. I would suggest starting with a simple banner that opens a dialog showing the list of unknown flags and which apps reported them. <img width="497" alt="image" src="https://github.com/user-attachments/assets/b7348e0d-0163-4be4-a7f8-c072e8464331" /> |
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