Azure / Azure/azure-functions-host

EventSource Log Size Exceeds 64KB Limit

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#11,235 1 comment 2 reactions 0 assignees View on GitHub
Logging and Metrics Needs: Triage (Functions)
Dominant language
C#
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Description

We're encountering an EventSourceException due to a log exceeding the maximum allowed size of 64KB. As a result, the event is not being logged properly. While the root cause of the issue is still unknown, we suspect that the missing log might contain relevant information that could help with debugging.

> EventSourceException while processing event 'RaiseFunctionsEventVerbose:': The payload for a single event is too large

Contributor guide

Open the contributing guide

Research direction

Start by tracing the EventSourceException for the RaiseFunctionsEventVerbose event and reproduce the payload that exceeds the 64KB limit. Investigate why the event is not logged and use the missing log information to identify the root cause; done means the oversized-event behavior is understood and logging or handling is corrected.

Written by the indexing model from the issue text.

Assessment

Tech stack
azure, csharp
Domain
backend, observability
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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