Azure Functions

Azure Functions is a serverless solution that allows you to write less code, maintain less infrastructure, and save on costs. This integration helps in monitoring the health, tracking executions, and estimating the cost of your function apps.

Log and metric types

The Sumo Logic app for Azure Functions app uses the following log and metrics types:

• Function Application Logs. Log generated by the Function App. It includes the logs emitted by the Functions host and logs emitted by customer code. Use these logs to monitor application health, performance, and behavior. For more information on supported metrics, refer to Azure documentation.
• App Service Authentication Logs. App Service Authentication Logs are generated for common Warning and Error logs from the App Service authentication requests. For more information on supported metrics, refer to Azure documentation.

To learn more about configuring monitoring for Azure functions, refer to the Azure documentation.

• Activity logs. Provides insight into any subscription-level or management group level events that have occurred in Azure. To learn more, refer to Azure documentation.

• Azure Functions specific metrics. These are metrics specific to Functions like execution count and execution units. For more information on supported metrics, refer to Azure documentation.

• General App Service metrics. Metrics which App Service platform implements. These metrics are available in the Microsoft.Web/sites namespace. For more information on supported metrics, refer to Azure documentation.

Sample queries

Error by function app

tenant_name=* subscription_id=* location=* resource_group=* provider_name=microsoft.web resource_type=sites  resource_name=* (metric=Http4xx or metric=Http5xx) statistic=total

Setup

Azure service sends monitoring data to Azure Monitor, which can then stream data to Eventhub. Sumo Logic supports:

• Logs collection from Azure Monitor using our Azure Event Hubs source.
• Metrics collection using our Azure Metrics Source.

You must explicitly enable diagnostic settings for each Azure Functions you want to monitor. Diagnostic Settings are not supported for function apps running on version 1.x. You can forward logs to the same Event Hub provided they satisfy the limitations and permissions as described here.

When you configure the event hubs source or HTTP source, plan your source category to ease the querying process. A hierarchical approach allows you to make use of wildcards. For example: Azure/FunctionApp/Logs, Azure/FunctionApp/Metrics.

Configure metrics collection

To set up the Azure Metrics source in Sumo Logic, refer to Azure Metrics Source.

Configure logs collection

Diagnostic logs

In this section, you will configure a pipeline for shipping diagnostic logs from Azure Monitor to an Event Hub.

1. To set up the Azure Event Hubs source in Sumo Logic, refer to the Azure Event Hubs Source for Logs.
2. To create the Diagnostic setting in the Azure portal, refer to the Azure documentation. Perform the steps below for each Azure Functions that you want to monitor.
   1. Choose Stream to an event hub as the destination.
   2. Select AllMetrics.
   3. Use the Event Hub namespace and Event Hub name configured in the previous step in the destination details section. You can use the default policy RootManageSharedAccessKey as the policy name.
      
3. Tag the location field in the source with the right location value.
   

Activity logs (optional)

To collect activity logs, follow the instructions here. If you are already collecting activity logs for a subscription, do not perform this step.

note

Since this source contains logs from multiple regions, make sure that you do not tag this source with the location tag.

Enabling Microsoft Defender for Cloud

For Security events, make sure you enable Microsoft Defender for Cloud. In Defender Plans Settings page toggle the App Service status under Cloud Workload Protection section.

Enabling health check metric

For getting the health check metric, make sure you enable Health check under the Monitoring dropdown.

Installing the Azure Functions app

This section provides instructions on how to install the Azure Functions app and shows examples of each of the preconfigured dashboards you can use to analyze your data.

To install the app, do the following:

note

Next-Gen App: To install or update the app, you must be an account administrator or a user with Manage Apps, Manage Monitors, Manage Fields, Manage Metric Rules, and Manage Collectors capabilities depending upon the different content types part of the app.

1. Select App Catalog.
2. In the 🔎 Search Apps field, run a search for your desired app, then select it.
3. Click Install App.
   note

   Sometimes this button says Add Integration.

4. Click Next in the Setup Data section.
5. In the Configure section of your respective app, complete the following fields.
   1. Field Name. If you already have collectors and sources set up, select the configured metadata field name (eg _sourcecategory) or specify other custom metadata (eg: _collector) along with its metadata Field Value.
6. Click Next. You will be redirected to the Preview & Done section.

Post-installation

Once your app is installed, it will appear in your Installed Apps folder, and dashboard panels will start to fill automatically.

Each panel slowly fills with data matching the time range query received since the panel was created. Results will not immediately be available but will be updated with full graphs and charts over time.

As part of the app installation process, the following fields will be created by default:

• tenant_name. This field is tagged at the collector level. You can get the tenant name using the instructions here.
• location. The region to which the resource name belongs to.
• subscription_id. ID associated with a subscription where the resource is present.
• resource_group. The resource group name where the Azure resource is present.
• provider_name. Azure resource provider name (for example, Microsoft.Network).
• resource_type. Azure resource type (for example, storage accounts).
• resource_name. The name of the resource (for example, storage account name).
• service_type. Type of the service that can be accessed with a Azure resource.
• service_name. Services that can be accessed with an Azure resource (for example, in Azure Container Instances the service is Subscriptions).

Viewing the Azure Functions dashboards

All dashboards have a set of filters that you can apply to the entire dashboard. Use these filters to drill down and examine the data to a granular level.

• You can change the time range for a dashboard or panel by selecting a predefined interval from a drop-down list, choosing a recently used time range, or specifying custom dates and times. Learn more.
• You can use template variables to drill down and examine the data on a granular level. For more information, see Filtering Dashboards with Template Variables.
• Most Next-Gen apps allow you to provide the scope at the installation time and are comprised of a key (_sourceCategory by default) and a default value for this key. Based on your input, the app dashboards will be parameterized with a dashboard variable, allowing you to change the dataset queried by all panels. This eliminates the need to create multiple copies of the same dashboard with different queries.

Overview

The Azure Functions - Overview dashboard provides comprehensive information on all the service health incidents or resource health events associated with Azure Functions in your Azure account.

Use this dashboard to:

• View recent resource and service health incidents.
• View distribution of service and resource health by incident type.

Cost

The Azure Functions - Cost dashboard provides information about the expenses associated with your Azure Functions. This includes details on the cost of resources, usage trends, and cost management insights.

Use this dashboard to:

• Monitor and analyze your spending on Azure Functions.
• Review cost trends and identify areas where you can optimize spending.
• Access detailed billing information and cost breakdowns.

Error

The Azure Functions - Error dashboard provides insights into errors encountered by your Azure Functions. This includes error rates, types of errors, and patterns over time.

Use this dashboard to:

• Track and investigate error occurrences in your Azure Functions.
• Identify and diagnose recurring error patterns.
• Review error logs and detailed reports to improve function reliability.

Memory

The Azure Functions - Memory dashboard provides information on memory usage and consumption by your Azure Functions. This includes metrics on memory allocation, usage patterns, and any potential memory issues.

Use this dashboard to:

• Monitor memory consumption and efficiency of your Azure Functions.
• Identify and address memory-related performance issues.
• Analyze trends in memory usage to optimize function performance.

Network

The Azure Functions - Network dashboard provides details on network traffic and connectivity related to your Azure Functions. This includes data on inbound and outbound traffic, network latency, and potential network issues.

Use this dashboard to:

• Track network activity and performance of your Azure Functions.
• Diagnose network-related issues and connectivity problems.
• Monitor network usage and optimize network configuration.

Operations

The Azure Functions - Operations dashboard provides an overview of operational metrics and activities related to your Azure Functions. This includes I/O Read, Write bytes/second and I/O Read, Write operations/second.

Use this dashboard to:

• Monitor the operational status and health of your Azure Functions.
• Review deployment activities and execution metrics.
• Analyze operational trends and optimize function management.

OS Statistics

The Azure Functions - OS Statistics dashboard provides information on operating system metrics and statistics relevant to your Azure Functions. This includes details on current assemblies, the number of processor threads, and other OS-level performance indicators.

Use this dashboard to:

• Track OS-level performance metrics impacting your Azure Functions.
• Monitor Current assemblies, threads, and handles for optimal performance.
• Identify and address OS-related performance issues.

Performance

The Azure Functions - Performance dashboard provides insights into the performance of your Azure Functions. This includes metrics on execution times, throughput, and overall function efficiency.

Use this dashboard to:

• Monitor and analyze the performance of your Azure Functions.
• Identify performance bottlenecks and optimize function execution.
• Review performance metrics and trends to ensure optimal function performance.

Health

The Azure Functions - Health dashboard provides information on any service health incidents or resource health events associated with Azure Functions in your Azure account.

Use this dashboard to:

• View recent resource and service health incidents.
• View distribution of service and resource health by incident type.

Policy and Recommendations

The Azure Functions - Policy and Recommendations dashboard provides information on all effect action operations performed by Azure policy and recommendations events from Azure Advisor.

Use this dashboard to:

• Monitor policy events with warnings and errors.
• View recent failed policy events.
• View total recommendation events.
• Identify High Impact recommendations.
• View recent recommendation events and navigate to the affected resource.

Administrative Operations

The Azure Functions - Administrative Operations dashboard provides details on read/write/delete specific changes, different operations used, the top 10 operations that caused the most errors, and users performing admin operations.

Use this dashboard to:

• Identify top users performing administrative operations.
• View the Top 10 operations that caused the most errors.
• View recent read, write, and delete operations.

Instances

The Azure Functions - Instances dashboard provides information of all effect action details performed based on Azure Functions Instances.

Use this dashboard to:

• View recent resource usage and performance based on Instances.
• View distribution and service usage of resources by Instance.

Create monitors for Azure Functions app

From your App Catalog:

1. From the Sumo Logic navigation, select App Catalog.
2. In the Search Apps field, search for and then select your app.
3. Make sure the app is installed.
4. Navigate to What's Included tab and scroll down to the Monitors section.
5. Click Create next to the pre-configured monitors. In the create monitors window, adjust the trigger conditions and notifications settings based on your requirements.
6. Scroll down to Monitor Details.
7. Under Location click on New Folder.
   note

   By default, monitor will be saved in the root folder. So to make the maintenance easier, create a new folder in the location of your choice.

8. Enter Folder Name. Folder Description is optional.
   tip

   Using app version in the folder name will be helpful to determine the versioning for future updates.

9. Click Create. Once the folder is created, click on Save.

Azure Functions alerts

These alerts are metrics-based and will work for all Functions.

Alert Name	Description	Alert Condition	Recover Condition
Azure Functions - Average Response Time	This alert gets triggered when there is high response time detected in any Azure Function.	Count < 1	Count >= 1
Azure Functions - Delete function app	This alert gets triggered when a function app is deleted.	Count >= 1	Count < 1
Azure Functions - Health Check Status	This alert gets triggered when there is Health Check Status average drops less than 100.	Count < 100	Count >= 100
Azure Functions - Http 4xx Error	This alert gets triggered when HTTP 4xx errors are high in the Azure Functions.	Count > 25	Count =< 25
Azure Functions - Https Server Error	This alert gets triggered when HTTP 5xx errors are high in the Azure Functions.	Count > 25	Count =< 25

Upgrade/Downgrade the Azure Functions app (Optional)

To update the app, do the following:

note

Next-Gen App: To install or update the app, you must be an account administrator or a user with Manage Apps, Manage Monitors, Manage Fields, Manage Metric Rules, and Manage Collectors capabilities depending upon the different content types part of the app.

1. Select App Catalog.
2. In the Search Apps field, search for and then select your app.
   Optionally, you can identify apps that can be upgraded in the Upgrade available section.
3. To upgrade the app, select Upgrade from the Manage dropdown.
   1. If the upgrade does not have any configuration or property changes, you will be redirected to the Preview & Done section.
   2. If the upgrade has any configuration or property changes, you will be redirected to the Setup Data page.
   3. In the Configure section of your respective app, complete the following fields.
      1. Field Name. If you already have collectors and sources set up, select the configured metadata field name (eg _sourcecategory) or specify other custom metadata (eg: _collector) along with its metadata Field Value.
   4. Click Next. You will be redirected to the Preview & Done section.

Post-update

Your upgraded app will be installed in the Installed Apps folder and dashboard panels will start to fill automatically.

note

See our Release Notes changelog for new updates in the app.

To revert the app to a previous version, do the following:

1. Select App Catalog.
2. In the Search Apps field, search for and then select your app.
3. To version down the app, select Revert to < previous version of your app > from the Manage dropdown.

Uninstalling the Azure Functions app (Optional)

To uninstall the app, do the following:

1. Select App Catalog.
2. In the 🔎 Search Apps field, run a search for your desired app, then select it.
3. Click Uninstall.