Not able to get ECS fargate metrics on Datadog

I'm trying to set up Datadog for my ECS Fargate services:

• I created a separate ECS Fargate service for the Datadog agent.
• I provided the necessary environment variables for Datadog. env details

The issue is that I can only see metrics for the Datadog agent itself.

Edit: As a sidecar container it's working if I add my container on the same server where I have deployed Datadog, but I also want logs, which I am not able to achieve.

"containerDefinitions": [
        {
          //  ...private container details
            "essential": true,
            "environment": [
              //  ...other envs
                {
                    "name": "DD_SERVICE",
                    "value": "stage-webapp"
                },
                {
                    "name": "DD_TRACE_AGENT_URL",
                    "value": "datadoghq.com"
                },
                {
                    "name": "DD_TRACE_ENABLED",
                    "value": "true"
                },
                {
                    "name": "DD_LOGS_INJECTION",
                    "value": "true"
                },
                {
                    "name": "DD_ENV",
                    "value": "stage"
                },],
               
            "mountPoints": [],
            "volumesFrom": [],
            "logConfiguration": {
                "logDriver": "awslogs",
                "options": {
                    "awslogs-group": "stage/ecs/webapp",
                    "awslogs-region": "ap-southeast-2",
                    "awslogs-stream-prefix": "ecs"
                },
                "secretOptions": []
            },
            "systemControls": []
        },
        {
            "name": "datadog-agent",
            "image": "datadog/agent:7-rc",
            "cpu": 256,
            "memory": 512,
            "portMappings": [],
            "essential": true,
            "environment": [
                {
                    "name": "DD_APM_NON_LOCAL_TRAFFIC",
                    "value": "true"
                },
                {
                    "name": "DD_API_KEY",
                    "value": "your-api-key"
                },
                {
                    "name": "DD_COLLECT_ECS_METADATA",
                    "value": "true"
                },
                {
                    "name": "DD_CONTAINER_EXCLUDE",
                    "value": "name:datadog-agent"
                },
                {
                    "name": "DD_SITE",
                    "value": "datadoghq.com"
                },
                {
                    "name": "DD_APM_ENABLED",
                    "value": "true"
                },
                {
                    "name": "DD_ENV",
                    "value": "stage"
                },
                {
                    "name": "DD_LOGS_ENABLED",
                    "value": "true"
                },
                {
                    "name": "DD_ECS_FARGATE",
                    "value": "true"
                }
            ],
            "mountPoints": [],
            "volumesFrom": [],
            "logConfiguration": {
                "logDriver": "awslogs",
                "options": {
                    "awslogs-group": "/ecs/stage-webapp-dd",
                    "awslogs-region": "ap-southeast-2",
                    "awslogs-stream-prefix": "stage-webapp-dd"
                },
                "secretOptions": []
            },
            "healthCheck": {
              //  healthCheck details
            },
            "systemControls": []
        }
    ],

On node.js side i did this :

const tracer = require("dd-trace");

// Initialized in a different file to avoid hoisting.
tracer.init();

module.exports = tracer;

Each ECS Fargate task instance is running in a completely isolated compute environment, so the only way for the Datadog agent to get access to the metrics it tracks is for it to run inside that same compute environment. The Datadog agent for ECS Fargate is designed to run as a sidecar container in each of your existing ECS tasks.

Per the Datadog documentation:

To monitor your ECS Fargate tasks with Datadog, run the Agent as a container in same task definition as your application container. To collect metrics with Datadog, each task definition should include a Datadog Agent container in addition to the application containers.

By running your Datadog agent as a completely separate ECS service, it only has access to its own metrics.