Azure Functions
An Azure service that provides an event-driven serverless compute platform.
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Extreme increase in traces produced by Azure Function leading to large consumption
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Veronika Miklinova
0
Reputation points
Our node.js Function App started producing extreme amount of traces (1500 per second). There was no change in the function from our side around that moment.
The function is triggered once every minute so the number or requests does not correspond to the number of traces. There are no errors and the function works so it generated a huge expense without alerting us that something is wrong.
We stopped the function now but we need to find out what happened.
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Khadeer Ali 4,615 Reputation points Microsoft External Staff2025-04-15T09:58:15.78+00:00 Thanks for reaching out.
Since the trace volume increased so significantly without any changes to the function itself, we’d like to understand a bit more about the environment to help narrow this down. Could you let us know:
Are you using any monitoring tools like Application Insights or OpenTelemetry that might be auto-collecting logs or traces?
Have there been any changes to the platform, hosting environment, or connected services that the function relies on—either manually or through automated updates?
Even small shifts (like SDK or runtime updates) could potentially impact the amount of telemetry being generated.
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Veronika Miklinova 0 Reputation points
2025-04-15T10:05:41.5533333+00:00 Hi Khadeer,
Thanks for your response.
Yes, we are using Application Insights. Through logging into Application Insights we can see the traces in the Log Analytics workspace. The large expenses are assigned to the application insights.
The content of the trace is information that one of the function was called with no data.
We did not change the platform, the environment or any settings on the connected resources.
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Khadeer Ali 4,615 Reputation points Microsoft External Staff
2025-04-15T10:21:33.5833333+00:00 Could you please check the private message and provide the requested details to investigate the issue further.
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