Find out incoming numbers of request in NLB balancer.

To find out the incoming number of requests in your Network Load Balancer, you can use Amazon CloudWatch metrics. Here's a step-by-step guide:

Step 1: Access the CloudWatch Console Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/

Step 2: Navigate to Metrics In the navigation pane on the left side, choose "Metrics"

Step 3: Select the NetworkELB Namespace Select the "NetworkELB" namespace from the available options

Step 4: View Relevant Metrics To track incoming requests, you'll want to monitor the "NewFlowCount" metric, which represents the total number of new flows (or connections) established from clients to targets. This metric is available in different variants:

• NewFlowCount (total)
• NewFlowCount_TCP (for TCP connections)
• NewFlowCount_TLS (for TLS connections)
• NewFlowCount_UDP (for UDP connections)
• NewFlowCount_QUIC (for QUIC connections)

Step 5: Filter by Your Load Balancer You can filter the metrics by specific dimensions such as:

• LoadBalancer (to view metrics for a specific Network Load Balancer)
• AvailabilityZone (to view metrics per availability zone)
• TargetGroup (to view metrics per target group)

Optional: Search for Specific Metrics If you want to view a metric across all dimensions, you can type its name (like "NewFlowCount") in the search field

The metrics are reported to CloudWatch in 60-second intervals when requests are flowing through the load balancer, allowing you to monitor your incoming traffic patterns over time.
Sources
CloudWatch metrics for your Network Load Balancer - Elastic Load Balancing
Monitor your Network Load Balancers - Elastic Load Balancing