Provide integration with Azure Monitor

[tomkerkhove]

Provide integration with Azure Monitor where it will automatically query the Azure Monitor REST API for a set of metrics and expose them via the scrape endpoint.

Depends on #3.

Specifications

• Integrate with the Azure Monitor REST API
• Provide a way to configure one or more metrics to query
• Provide a way to configure how often you should pull latest representation of a metric
• Provide documentation on how to configure the metrics
• Provide documentation on how often you should pull latest representation of a metric
• Provide documentation on how to configure the authentication with Azure Monitor

Configuration

Metrics to scrape:

metrics:
- metric:
  name: "my-name"
  resource-type: "Microsoft.ServiceBus"
- metric:
  name: "my-name"
  resource-type: "Microsoft.WebApps"

Scrape frequency:

• PROMITOR_SCRAPE_SCHEDULE

Azure authentication:

• PROMITOR_AUTH_APPID
• PROMITOR_AUTH_APPKEY

[tomkerkhove]

Current proposal for configuration:

azureConfiguration: 
  resourceGroupName: foo
  subscriptionId: bar
metrics: 
    # v1.0
  - name: "queue-size"
    description: "Size of the 'myqueue' queue"
    namespace: "myNamespace"
    queueName: "myqueue"
    resourceType: ServiceBusQueue
    # Supported in later version - This will compose the following URL to query (subscriptions/abc/resourceGroups/xyz/providers/Microsoft.ServiceBus/namespaces/monitor-integration)
  - name: "queue-size-generic" # Metric without description
    resourceType: Generic
    resourceProvider: "Microsoft.ServiceBus"
    resourceSuffix: "namespaces/monitor-integration" # Provide better name for this
    filterExpression: "EntityName eq 'myqueue'"
    resourceGroupName: xyz # Overrides default Azure configuration
    subscriptionId: abc    # Overrides default Azure configuration

[tomkerkhove]

This is currently what you need to query for Azure Service Bus:

azureMetadata:
  tenantId: tenant-x
  subscriptionId: foo
  resourceGroupName: bar
metrics: 
    # v1.0
  - name: demo_queue_size
    description: "Size of the 'myqueue' queue"
    namespace: myNamespace
    azureMetricName: ActiveMessages
    azureMetricAggregation: Average
    queueName: myqueue
    resourceType: ServiceBusQueue

However, I don't like the names for azureMetricName & azureMetricAggregation so will need to come up with a better name

[tomkerkhove]

Change the structure to the following approach:

azureMetadata:
  tenantId: tenant-x
  subscriptionId: foo
  resourceGroupName: bar
metrics: 
    # v1.0
  - name: demo_queue_size
    description: "Size of the 'myqueue' queue"
    resourceType: ServiceBusQueue
    namespace: myNamespace
    queueName: myQueue
    azureMetricConfiguration:
      metricName: Size
      aggregation: Average

This should be more readable than before

[tomkerkhove]

Scraping Azure Monitor works but it needs some improvements.

[tomkerkhove]

First rough release is ready ✔️