🧭 Metric #1: Application Latency (p95) via ALB. This is the front-door latency seen by the client, using ALB metrics:

p95.tf

resource "awscc_applicationsignals_service_level_objective" "alb_latency_slo" {
  name        = "alb-latency-slo"
  description = "Target response time for ALB in front of ECS Fargate service"

  sli = {
    comparison_operator = "LessThan"
    metric_threshold    = 500

    sli_metric = {
      metric_data_queries = [{
        id = "latency"
        metric_stat = {
          metric = {
            namespace   = "AWS/ApplicationELB"
            metric_name = "TargetResponseTime"
            dimensions = [
              {
                name  = "LoadBalancer"
                value = "app/my-alb-name/abc123"
              }
            ]
          }
          period = 300
          stat   = "p95"
        }
      }]
    }
  }

  goal = {
    attainment_goal = 99.0
    interval = {
      rolling_interval = {
        duration      = 7
        duration_unit = "DAY"
      }
    }
  }

  burn_rate_configurations = [
    { look_back_window_minutes = 60 },
    { look_back_window_minutes = 1440 }
  ]
}