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Four signals to investigate
1. A failed webhook request followed by another send
Check exporter and receiver logs for a failed HTTP request, then look for a later send containing the retained event data. The documented retry behavior is specific to the webhook exporter: retained data is retried when the next flush interval arrives or the maximum in-memory event count is reached. See the webhook exporter documentation.
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2. Similar event fields in the destination
Compare the event’s contextKind, userKey, creationDate, flag key, variation, value, default, optional configuration version, and source. These fields can help you find records to investigate, but the documented schema does not define a unique event ID. A matching user, flag, or result is not proof of duplicate delivery: separate evaluations may produce similar records. The example schema records timestamps in seconds. See flag usage tracking.
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GO Feature Flag documents webhook calls triggered by FlushInterval or MaxEventInMemory. Compare the configured values with the timing and size of observed sends. A burst near a flush or threshold is a useful diagnostic clue, not proof that crossing the threshold caused duplicate writes.
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4. A new evaluation rather than a retried delivery
GO Feature Flag exports evaluation events, with one feature event corresponding to a flag evaluation. A second evaluation can therefore create another event even when transport delivery worked normally. Check application and evaluation logs to establish whether the records correspond to separate evaluations before treating them as a retried batch. See flag usage tracking and the exporter concepts documentation.
Trace the evaluation path
If your application uses the OpenFeature Go provider, determine whether it runs in INPROCESS or REMOTE mode. In-process mode retrieves configuration and evaluates locally; remote mode evaluates through the relay proxy and can use client-side caching, with polling for flag changes. This identifies which application, proxy, and exporter logs may contain evidence about the event’s origin. The Go provider package documentation describes the modes.
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| Mode | Where evaluation happens | Request path to check | Caching |
|---|---|---|---|
INPROCESS |
Locally, after configuration retrieval | Application and its configuration-fetch path | Not stated here as a mode-specific guarantee |
REMOTE |
Through the relay proxy | Application, relay proxy, and exporter path | Can use client-side caching |
Check the exporter and receiver separately
Do not assume that every GO Feature Flag exporter has the webhook’s retry behavior. Exporters differ by destination and delivery model; establish whether the configured path is streaming or synchronous, or buffered or asynchronous, and inspect its actual settings. The exporter concepts documentation describes the available exporter approaches.
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- Record the configured flush interval and batch or in-memory event threshold where applicable.
- Compare exporter send attempts with receiver acknowledgments, errors, and writes.
- Check the receiver’s own behavior for retries, acknowledgment timing, transactions, and idempotency; those guarantees depend on that system and are not established by GO Feature Flag’s webhook documentation.
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 later. It does not promise exactly-once delivery or describe a documented idempotency key that deduplicates receiver writes. The event fields on the tracking page likewise do not establish a unique event identifier. Consequently, neither a retry nor matching fields alone proves that the destination has a duplicate; verify the delivery sequence against evaluation and receiver records.
Documentation versions differ: the webhook retry page is v1.52.0, exporter concepts are v1.55.3, and the landing page displayed v1.56.0. Compare the documentation with the version actually deployed before applying version-sensitive defaults or operational assumptions.
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