If a destination appears to contain duplicate writes from GO Feature Flag, first determine whether the exporter retried a failed delivery or whether the application evaluated the flag more than once. GO Feature Flag documents that its webhook exporter keeps event data in memory after a failed HTTP request and retries at the next flush interval or when its in-memory event limit is reached. That behavior makes retries worth investigating, but it does not prove a destination record is duplicated or guarantee exactly-once delivery.
1. Look for a failed webhook call followed by another send
The clearest retry signal is a failed webhook request followed by a later attempt to send retained event data. The GO Feature Flag webhook exporter documentation says data remains in memory after an HTTP call fails and is retried when the next flush interval arrives or the maximum number of in-memory events is reached. Check exporter and receiver logs for the failed request, the subsequent request, and the records in each batch. GO Feature Flag webhook exporter documentation.
A later send is evidence of retry behavior, not proof that the receiver committed the earlier request. Compare the receiver’s response and write logs with the exporter’s request logs to establish what happened on each attempt.
2. Compare event fields, but do not treat a match as proof
GO Feature Flag’s documented evaluation-event schema includes fields that help compare records: contextKind, userKey, creationDate, the flag key, variation, value, default, optional configuration version, and source. Review these fields across destination records and, where possible, match them against the event payloads in exporter logs. GO Feature Flag flag-usage tracking documentation.
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The documented fields do not define a unique event ID. Two records with the same user, flag, result, or timestamp may reflect separate evaluations rather than duplicate delivery. In the example schema, timestamps are expressed in seconds, so they may not distinguish events that occur close together.
3. Check whether repeated writes align with flush or batch thresholds
The webhook exporter can send when either FlushInterval expires or MaxEventInMemory is reached. Compare the timing and size of destination bursts with those configured values. A pattern that follows a flush schedule or event-count threshold is a useful diagnostic clue, not a documented claim that crossing a threshold creates duplicate writes. GO Feature Flag webhook exporter documentation.
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Also identify which exporter is active. GO Feature Flag documents multiple exporter types and delivery models; the webhook exporter’s retry behavior should not be assumed to apply to every exporter. Check the configured destination, whether the path is streaming or buffered, its flush and batch settings, and the receiver’s acknowledgment and write behavior. GO Feature Flag exporter concepts.
4. Rule out a second evaluation
GO Feature Flag exports evaluation events, with one feature event corresponding to a flag evaluation. If the application evaluates a flag repeatedly, those distinct evaluations can produce similar-looking events even when webhook delivery is healthy. Use application logs or traces to check whether the records correspond to separate evaluation calls before attributing them to a transport retry. GO Feature Flag flag-usage tracking documentation and GO Feature Flag exporter concepts.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsTrace the evaluation path before tracing the export
If the application uses the OpenFeature Go provider, establish whether it runs in INPROCESS or REMOTE mode. In-process mode retrieves configuration and evaluates locally. Remote mode performs evaluations through the relay proxy and can use client-side caching, with polling for flag changes. This distinction helps locate the evaluation request path; it does not by itself establish whether an export was retried. OpenFeature Go provider package documentation.
| Mode | Where evaluation occurs | Relay proxy in evaluation path? | Other documented detail |
|---|---|---|---|
INPROCESS |
Locally, after configuration is fetched | No; evaluation is local | Configuration is fetched before local evaluation. |
REMOTE |
Through the relay proxy | Yes | Can use client-side caching and polling for flag changes. |
Delivery guarantees also depend on the receiver. Its acknowledgment, retry, transaction, and idempotency behavior must be checked in that service’s own documentation and logs; GO Feature Flag’s webhook documentation does not establish how a particular downstream system handles repeated requests.
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What the documentation does—and does not—guarantee
The reviewed webhook documentation describes retaining event data in memory after a failed HTTP call and retrying it later. It does not document an exactly-once delivery guarantee or an idempotency key for deduplicating receiver writes. Do not assume that a failed response means the receiver made no write, or that a retry will automatically be deduplicated.
Documentation versions can differ. The GO Feature Flag documentation landing page displayed v1.56.0, while the specific webhook retry page was v1.52.0 and the exporter concepts page was v1.55.3. The OpenFeature Go provider package documentation describes the current modes. Check the documentation matching the version deployed before relying on defaults or applying version-specific operational advice.
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