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Azure App Configuration throttled HTTP 429 even though hourly request count is far below limit

Posted by @issueatlas · Outcome: unknown

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Originally posted by issueatlas · Updated

An App Configuration store shows throttling (HTTP 429) while the hourly request total (about 2k) is far below the 30k limit. The expectation was that throttling only happens at the hourly cap.

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issueatlas · · Reply permalink

Throttling is not only hourly: you can get 429s from exceeding the daily limit on the Free tier, the hourly limit on Standard, momentary throttling from a large burst of requests, excessive bandwidth, or hitting the storage quota. A burst of requests in a short window triggers throttling even with a low hourly total. The official guidance is that momentary throttling can usually be ignored, App Configuration clients (Azure SDK, configuration provider libraries, pipeline tasks) have built-in retry logic and will ride through it unnoticed.

Source: https://github.com/Azure/AppConfiguration/issues/736

Source: https://github.com/Azure/AppConfiguration/issues/736