Nova-Rewards/terraform/cloudwatch.tf at main · ghzhost/Nova-Rewards · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
# CloudWatch Log Group
resource "aws_cloudwatch_log_group" "app" {
  name              = "/nova-rewards/${var.environment}/app"
  retention_in_days = var.environment == "prod" ? 30 : 7

  tags = merge(
    var.tags,
    {
      Name = "${var.app_name}-logs"
    }
  )
}

# CloudWatch Alarm - Memory High (via custom metric)
resource "aws_cloudwatch_metric_alarm" "memory_high" {
  alarm_name          = "${var.app_name}-memory-high"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "2"
  metric_name         = "MemoryUtilization"
  namespace           = "NovaRewards"
  period              = "300"
  statistic           = "Average"
  threshold           = var.memory_threshold
  alarm_description   = "Alarm when memory exceeds ${var.memory_threshold}%"
  alarm_actions       = [aws_autoscaling_policy.scale_up.arn]

  dimensions = {
    AutoScalingGroupName = aws_autoscaling_group.app.name
  }

  treat_missing_data = "notBreaching"
}

# CloudWatch Alarm - 5xx Error Rate High
resource "aws_cloudwatch_metric_alarm" "error_rate_high" {
  alarm_name          = "${var.app_name}-5xx-error-rate-high"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "2"
  metric_name         = "HTTPCode_Target_5XX_Count"
  namespace           = "AWS/ApplicationELB"
  period              = "300"
  statistic           = "Sum"
  threshold           = var.error_rate_threshold * 100 # Approximate threshold
  alarm_description   = "Alarm when 5xx error rate exceeds ${var.error_rate_threshold}%"

  dimensions = {
    LoadBalancer = aws_lb.main.arn_suffix
    TargetGroup  = aws_lb_target_group.app.arn_suffix
  }

  treat_missing_data = "notBreaching"
}

# CloudWatch Alarm - Target Group Unhealthy Hosts
resource "aws_cloudwatch_metric_alarm" "unhealthy_hosts" {
  alarm_name          = "${var.app_name}-unhealthy-hosts"
  comparison_operator = "GreaterThanOrEqualToThreshold"
  evaluation_periods  = "2"
  metric_name         = "UnHealthyHostCount"
  namespace           = "AWS/ApplicationELB"
  period              = "300"
  statistic           = "Average"
  threshold           = "1"
  alarm_description   = "Alarm when there are unhealthy hosts"

  dimensions = {
    LoadBalancer = aws_lb.main.arn_suffix
    TargetGroup  = aws_lb_target_group.app.arn_suffix
  }

  treat_missing_data = "notBreaching"
}

# CloudWatch Alarm - ALB Response Time
resource "aws_cloudwatch_metric_alarm" "response_time_high" {
  alarm_name          = "${var.app_name}-response-time-high"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "2"
  metric_name         = "TargetResponseTime"
  namespace           = "AWS/ApplicationELB"
  period              = "300"
  statistic           = "Average"
  threshold           = "1" # 1 second
  alarm_description   = "Alarm when response time exceeds 1 second"

  dimensions = {
    LoadBalancer = aws_lb.main.arn_suffix
  }

  treat_missing_data = "notBreaching"
}

# CloudWatch Dashboard
resource "aws_cloudwatch_dashboard" "main" {
  dashboard_name = "${var.app_name}-${var.environment}"

  dashboard_body = jsonencode({
    widgets = [
      {
        type = "metric"
        properties = {
          metrics = [
            ["AWS/EC2", "CPUUtilization", { stat = "Average" }],
            ["NovaRewards", "MemoryUtilization", { stat = "Average" }],
            ["AWS/ApplicationELB", "HTTPCode_Target_5XX_Count", { stat = "Sum" }],
            ["AWS/ApplicationELB", "TargetResponseTime", { stat = "Average" }],
            ["AWS/ApplicationELB", "HealthyHostCount", { stat = "Average" }],
            ["AWS/ApplicationELB", "UnHealthyHostCount", { stat = "Average" }]
          ]
          period = 300
          stat   = "Average"
          region = data.aws_region.current.name
          title  = "Nova Rewards Application Metrics"
        }
      },
      {
        type = "metric"
        properties = {
          metrics = [
            ["AWS/ApplicationELB", "RequestCount", { stat = "Sum" }],
            ["AWS/ApplicationELB", "HTTPCode_Target_2XX_Count", { stat = "Sum" }],
            ["AWS/ApplicationELB", "HTTPCode_Target_4XX_Count", { stat = "Sum" }],
            ["AWS/ApplicationELB", "HTTPCode_Target_5XX_Count", { stat = "Sum" }]
          ]
          period = 300
          stat   = "Sum"
          region = data.aws_region.current.name
          title  = "ALB Request Metrics"
        }
      }
    ]
  })
}