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Copy file name to clipboardExpand all lines: articles/azure-functions/configure-monitoring.md
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***Tune your functions telemetry**: with the default log level set to `Error` or `Warning`, no detailed information from each function will be gathered (dependencies, custom metrics, custom events, and traces). For those functions that are key for production monitoring, define an explicit entry for `Function.<YOUR_FUNCTION_NAME>` category and set it to `Information`, so you can gather detailed information. At this point, to avoid gathering [user-generated logs](functions-monitoring.md#writing-to-logs) at `Information` level, set the `Function.<YOUR_FUNCTION_NAME>.User` category to `Error` or `Warning` log level.
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***Host.Aggregator category**: as described in [Configure categories](#configure-categories), this category provides aggregated information of function invocations. The information from this category is gathered in Application Insights `customMetrics` table, and it's shown in the function Overview tab in the Azure portal. If you set this category to other value different than `Information`, you will stop gathering the data in the `customMetrics` table and will not be displayed function details at the Azure portal. Depending on how you configure the aggregator, consider that there will be a delay (determined by the `flushTimeout`) in the telemetry gathered.
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***Host.Aggregator category**: as described in [Configure categories](#configure-categories), this category provides aggregated information of function invocations. The information from this category is gathered in Application Insights `customMetrics` table, and it's shown in the function Overview tab in the Azure portal. Depending on how you configure the aggregator, consider that there will be a delay, determined by the `flushTimeout`, in the telemetry gathered. If you set this category to other value different than `Information`, you will stop gathering the data in the `customMetrics` table and will not display metrics in the function Overview tab.
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The following screenshot shows Host.Aggregator telemetry data displayed in the function Overview tab.
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:::image type="content" source="media/configure-monitoring/host-aggregator-function-overview.png" alt-text="Screenshot of Host.Aggregator telemetry displayed in function Overview tab." lightbox="media/configure-monitoring/host-aggregator-function-overview-big.png":::
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The following screenshot shows Host.Aggregator telemetry data in Application Insights customMetrics table.
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:::image type="content" source="media/configure-monitoring/host-aggregator-custom-metrics.png" alt-text="Screenshot of Host.Aggregator telemetry in customMetrics Application Insights table." lightbox="media/configure-monitoring/host-aggregator-custom-metrics-big.png":::
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***Host.Results category**: as described in [Configure categories](#configure-categories), this category provides the runtime-generated logs indicating the success or failure of a function invocation. The information from this category is gathered in the Application Insights `requests` table, and it is shown in the function Monitor tab and in different Application Insights dashboards (Performance, Failures...). If you set this category to other value different than `Information`, you will stop gathering detailed data in the `requests` table and will not be displayed it the mentioned dashboards (for example, setting it to `error` results in tracking requests data only for failed executions).
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***Host.Results category**: as described in [Configure categories](#configure-categories), this category provides the runtime-generated logs indicating the success or failure of a function invocation. The information from this category is gathered in the Application Insights `requests` table, and it is shown in the function Monitor tab and in different Application Insights dashboards (Performance, Failures...). If you set this category to other value different than `Information`, you will only gather telemetry generated at the log level defined (or higher), for example, setting it to `error` results in tracking requests data only for failed executions.
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The following screenshot shows the Host.Results telemetry data displayed in the function Monitor tab.
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:::image type="content" source="media/configure-monitoring/host-results-function-monitor.png" alt-text="Screenshot of Host.Results telemetry in function Monitor tab." lightbox="media/configure-monitoring/host-results-function-monitor-big.png":::
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