VALENTINERONTEZ.

1resource "aws_ecs_service" "api" {
2  name            = "rontez-api"
3  cluster         = aws_ecs_cluster.main.id
4  task_definition = aws_ecs_task.api.arn
5  desired_count   = 3
6  launch_type     = "FARGATE"
7.
8  network_configuration {
9    subnets          = var.private_subnets
10    security_groups  = [aws_security_group.api.id]
11    assign_public_ip = false
12  }
13.
14  load_balancer {
15    target_group_arn = aws_lb_target_group.api.arn
16    container_name   = "api"
17    container_port   = 8000
18  }
19}
20.
21resource "aws_appautoscaling_target" "api" {
22  max_capacity       = 12
23  min_capacity       = 3
24  resource_id        = "service/rontez/rontez-api"
25  scalable_dimension = "ecs:service:DesiredCount"
26  service_namespace  = "ecs"
27}

1from fastapi import FastAPI, Request
2from prometheus_client import Histogram, Counter
3import httpx, time
4.
5app = FastAPI(title="Observability Service")
6.
7latency = Histogram(
8    "request_duration_seconds",
9    "Request latency",
10    buckets=[0.01, 0.05, 0.1, 0.5, 1.0]
11)
12requests_total = Counter(
13    "requests_total",
14    "Total requests",
15    ["method", "endpoint", "status"]
16)
17.
18@app.middleware("http")
19async def metrics(req: Request, call_next):
20    start = time.perf_counter()
21    response = await call_next(req)
22    elapsed = time.perf_counter() - start
23    latency.observe(elapsed)
24    requests_total.labels(
25        req.method, req.url.path,
26        response.status_code
27    ).inc()
28    return response