How to implement a kill switch

Publish killSwitch. Do not wait for a binary.

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Check hasFeature("payments_v2") in code. When that path misbehaves, set killSwitch on the production environment draft and publish. Browser sessions on SSE refresh. Node refreshes on the next evaluate-all unless you set flags.pollIntervalMs.

You turn the switch on yourself in the dashboard, then publish. FlagFix does not flip it from an error rate.

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Progressive rollouts explained

Publish a rule with rolloutPercent.

How to track events in Node.js

Identify the request, track, and flush.