The Functions runtime generates important telemetry during startup, but some logs are sampled out due to Adaptive sampling being enabled by default with a MaxTelemetryItemsPerSecond of 20. This results in some startup logs being lost when the sampling processor makes its decision.
The proposed change introduces a 15-second delay before Adaptive sampling begins, allowing initial telemetry to be more reliably ingested into AppInsights. The delay duration can be configured, and the feature can be disabled via host.json or appsettings override.
Resolves #3100
The Functions runtime generates important telemetry during startup, but some logs are sampled out due to Adaptive sampling being enabled by default with a
MaxTelemetryItemsPerSecondof 20. This results in some startup logs being lost when the sampling processor makes its decision.The proposed change introduces a 15-second delay before Adaptive sampling begins, allowing initial telemetry to be more reliably ingested into AppInsights. The delay duration can be configured, and the feature can be disabled via host.json or appsettings override.