Azure Cache for Redis

Azure Cache for Redis provides an in-memory data store based on the Redis software. It offers both the Redis open-source (OSS Redis) and a commercial product from Redis Inc. (Redis Enterprise) as a managed service. This integration helps in tracking cache performance (miss rate, latency, read and write rate) and monitor resource usage (CPU, used memory, server load, and connections) of your instances.

Log and metric types

For Azure Cache for Redis, you can collect the following logs and metrics:

• Connection logs. These logs contains information about the connections to the cache for security and diagnostic purposes. To learn more about the limitations of connection logging and schemas collected for Azure Cache for Redis, refer to the Azure documentation.
• Activity logs, provides insight into any subscription-level or management group level events that have occurred in the Azure. To learn more, refer to Azure documentation.
• Cache Metrics. These metrics are available in Microsoft.Cache/redis and Microsoft.Cache/redisEnterprise namespace. For more information on supported metrics, refer to the Azure documentation.

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.
• Activity Logs collection from Azure Monitor using our Azure Event Hubs source. It is recommended to create a separate source for activity logs. If you are already collecting these logs, you can skip this step.
• Metrics collection using our HTTP Logs and Metrics source via Azure Functions deployed using the ARM template.

You must explicitly enable diagnostic settings for each Azure Cache for Redis you want to monitor. 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/RedisCache/Logs and Azure/RedisCache/Metrics.

Configure field in field schema

1. Classic UI. In the main Sumo Logic menu, select Manage Data > Logs > Fields.
   New UI. In the top menu select Configuration, and then under Logs select Fields. You can also click the Go To... menu at the top of the screen and select Fields.
2. Search for the following fields:
   • tenant_name. This field is tagged at the collector level. You can get the tenant name using the instructions in the Microsoft Documentation.
   • 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, Azure SQL databases in Azure SQL Server).
3. Create the fields if they are not present. Refer to Manage fields.

Configure Field Extraction Rules

Create the following Field Extraction Rules (FER) for Azure Storage by following the instructions in the Create a Field Extraction Rule.

Azure location extraction FER

Rule Name: AzureLocationExtractionFER
Applied at: Ingest Time
Scope (Specific Data): tenant_name=*

Parse Expression

json "location", "properties.resourceLocation", "properties.region" as location, resourceLocation, service_region nodrop
| replace(toLowerCase(resourceLocation), " ", "") as resourceLocation
| if (!isBlank(resourceLocation), resourceLocation, location) as location
| if (!isBlank(service_region), service_region, location) as location 
| if (isBlank(location), "global", location) as location
| fields location

Resource ID extraction FER

Rule Name: AzureResourceIdExtractionFER
Applied at: Ingest Time
Scope (Specific Data): tenant_name=*

Parse Expression

json "resourceId", "ResourceId" as resourceId1, resourceId2 nodrop
| if (isBlank(resourceId1), resourceId2, resourceId1) as resourceId
| toUpperCase(resourceId) as resourceId
| parse regex field=resourceId "/SUBSCRIPTIONS/(?<subscription_id>[^/]+)" nodrop
| parse field=resourceId "/RESOURCEGROUPS/*/" as resource_group nodrop
| parse regex field=resourceId "/PROVIDERS/(?<provider_name>[^/]+)" nodrop
| parse regex field=resourceId "/PROVIDERS/[^/]+(?:/LOCATIONS/[^/]+)?/(?<resource_type>[^/]+)/(?<resource_name>.+)" nodrop
| parse regex field=resource_name "(?<parent_resource_name>[^/]+)(?:/PROVIDERS/[^/]+)?/(?<service_type>[^/]+)/?(?<service_name>.+)" nodrop
| if (isBlank(parent_resource_name), resource_name, parent_resource_name) as resource_name
| fields subscription_id, location, provider_name, resource_group, resource_type, resource_name, service_type, service_name

Configure metric rules

Create the following metrics rules by following the instructions in Create a metrics rule.

Azure observability metadata extraction redis cache level

Rule Name: AzureObservabilityMetadataExtractionRedisCacheLevel

Metric match expression

resourceId=/SUBSCRIPTIONS/*/RESOURCEGROUPS/*/PROVIDERS/*/REDIS/* tenant_name=*

Fields extracted	Metric rule
subscription_id	$resourceId._1
resource_group	$resourceId._2
provider_name	$resourceId._3
resource_type	REDIS
resource_name	$resourceId._4

Rule Name: AzureObservabilityMetadataExtractionEnterpriseRedisCacheLevel

Metric match expression

resourceId=/SUBSCRIPTIONS/*/RESOURCEGROUPS/*/PROVIDERS/*/REDISENTERPRISE/* tenant_name=*

Fields extracted	Metric rule
subscription_id	$resourceId._1
resource_group	$resourceId._2
provider_name	$resourceId._3
resource_type	REDISENTERPRISE
resource_name	$resourceId._4

Configure metrics collection

In this section, you will configure a pipeline for shipping metrics from Azure Monitor to an Event Hub, on to an Azure Function, and finally to an HTTP Source on a hosted collector in Sumo Logic.

1. Create hosted collector and tag tenant_name field.
   
2. Configure an HTTP Source.
3. Configure and deploy the ARM Template.
4. Export metrics to Event Hub. Perform below steps for each Redis Cache resource that you want to monitor.
   • Choose Stream to an event hub as destination.
   • Select AllMetrics.
   • Use the Event hub namespace created by the ARM template in Step 2 above. You can create a new Event hub or use the one created by ARM template. You can use the default policy RootManageSharedAccessKey as the policy name.
     
5. Tag the location field in the source with right location value.
   

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 settings in Azure portal, refer to the Azure documentation. Perform the steps below for each azure redis cache account that you want to monitor.
   1. Choose Stream to an event hub as the destination.
   2. Select allLogs.
   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 right location value.
   

Activity Logs

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

note

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

Installing the Azure Redis Cache app

Now that you have set up data collection, install the Azure Load Balancer Sumo Logic app to use the pre-configured dashboards that provide visibility into your environment for real-time analysis of overall usage.

To install the app:

1. Select App Catalog.
2. In the Search Apps field, search for and then select your app.
3. Optionally, you can scroll down to preview the dashboards included with the app. Then, click Install App (sometimes this button says Add Integration).
4. Click Next.
5. Look for the dialog confirming that your app was installed successfully.
   

Once an app is installed, it will appear in your Personal folder or the folder that you specified. From here, you can share it with other users in your organization. Dashboard panels will automatically start to fill with data matching the time range query received since you created the panel. Results won't be available immediately, but within about 20 minutes, you'll see completed graphs and maps.

Administrative Operations

The Azure Cache for Redis - Administrative Operations dashboard provides details like distribution by operation type, by operation, recent delete operations, top 10 operations that caused most errors, and users/applications by operation type.

Connections(Enterprise)

The Azure Cache for Redis - Connections(Enterprise) provides details like connections by location, total unique connected clients, total connections, event types, disconnection events, failure by operations, connected clients, cache read vs write, and hit vs misses.

Connections(Non-Enterprise)

The Azure Cache for Redis - Connections(Non-Enterprise) dashboard provides details like connections by location, total unique connected clients, total connections, top 10 ip's by connection count, connections by resource name, connected clients (instance based), connected clients, cache read vs write, and hit vs misses.

Geo Replication

The Azure Cache for Redis - Geo Replication dashboard provides details like geo-replication healthy - fetched from geo-secondary cache, geo-replication full sync events - fetched from geo-secondary cache, geo-replication data sync offset - fetched from geo-primary cache, and geo-replication connectivity lag - fetched from geo-secondary cache.

MSEntra Authentication Audit

The Azure Cache for Redis - MSEntra Authentication Audit dashboard provides details like requests by location, requests by resource name, requests by username, and MSEntra authentication audit details.

Policy and Recommendations

The Azure Cache for Redis - Policy and Recommendations dashboard provides details like total success policy events, total failed policy events, total recommendation events, and recent recommendation events.

Resource Operations

The Azure Cache for Redis - Resource Operations dashboard provides details like total operations, ops per second (max), gets, sets, evicted key count, and expired key count.

Resource Overview

The Azure Cache for Redis - Resource Overview dashboard provides details like max server load %, max CPU %, max bytes used, max number of connected clients, and errors.

Resource Performance

The Azure Cache for Redis - Resource Performance dashboard provides details like cache hits, cache misses, cache write (max), cache read (max), cache latency microseconds, and 99th percentile latency (max).

Troubleshooting

HTTP Logs and Metrics Source used by Azure Functions

To troubleshoot metrics collection, follow the instructions in Collect Metrics from Azure Monitor > Troubleshooting metrics collection.