AWS Cost Monitoring & Alerts

The workflow JSON

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{
  "name": "Cost Monitoring & Alerts",
  "nodes": [
    {
      "parameters": {
        "rule": {
          "interval": [
            {
              "field": "hours",
              "hoursInterval": 1
            }
          ]
        }
      },
      "name": "Hourly Schedule",
      "type": "n8n-nodes-base.scheduleTrigger",
      "typeVersion": 1,
      "position": [
        250,
        300
      ]
    },
    {
      "parameters": {
        "url": "http://prometheus:9090/api/v1/query",
        "qs": {
          "query": "sum(api_gateway_cost_total)"
        }
      },
      "name": "Query Total Costs",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 3,
      "position": [
        450,
        300
      ]
    },
    {
      "parameters": {
        "url": "http://prometheus:9090/api/v1/query",
        "qs": {
          "query": "sum(rate(api_gateway_cost_total[1h])) * 730"
        }
      },
      "name": "Query Monthly Projection",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 3,
      "position": [
        450,
        450
      ]
    },
    {
      "parameters": {
        "functionCode": "// Calculate cost metrics\nconst totalCost = parseFloat($input.first().json.data.result[0]?.value[1] || 0);\nconst monthlyProjection = parseFloat($input.last().json.data.result[0]?.value[1] || 0);\n\n// Thresholds\nconst DAILY_THRESHOLD = 10;  // $10/day\nconst MONTHLY_THRESHOLD = 200;  // $200/month\n\nconst alert = {\n  total_cost: totalCost.toFixed(2),\n  monthly_projection: monthlyProjection.toFixed(2),\n  daily_threshold_exceeded: totalCost > DAILY_THRESHOLD,\n  monthly_threshold_exceeded: monthlyProjection > MONTHLY_THRESHOLD,\n  timestamp: new Date().toISOString()\n};\n\nreturn alert;"
      },
      "name": "Calculate Metrics",
      "type": "n8n-nodes-base.function",
      "typeVersion": 1,
      "position": [
        650,
        375
      ]
    },
    {
      "parameters": {
        "conditions": {
          "boolean": [
            {
              "value1": "={{ $json.daily_threshold_exceeded || $json.monthly_threshold_exceeded }}",
              "value2": true
            }
          ]
        }
      },
      "name": "Check Thresholds",
      "type": "n8n-nodes-base.if",
      "typeVersion": 1,
      "position": [
        850,
        375
      ]
    },
    {
      "parameters": {
        "functionCode": "// Format alert message\nconst message = `\ud83d\udea8 API Cost Alert!\\n\\nTotal Cost: $${$json.total_cost}\\nMonthly Projection: $${$json.monthly_projection}\\n\\nTime to optimize routing!\\n\\nTimestamp: ${$json.timestamp}`;\n\nreturn { message };"
      },
      "name": "Format Alert",
      "type": "n8n-nodes-base.function",
      "typeVersion": 1,
      "position": [
        1050,
        375
      ]
    }
  ],
  "connections": {
    "Hourly Schedule": {
      "main": [
        [
          {
            "node": "Query Total Costs",
            "type": "main",
            "index": 0
          },
          {
            "node": "Query Monthly Projection",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Query Total Costs": {
      "main": [
        [
          {
            "node": "Calculate Metrics",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Query Monthly Projection": {
      "main": [
        [
          {
            "node": "Calculate Metrics",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Calculate Metrics": {
      "main": [
        [
          {
            "node": "Check Thresholds",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Check Thresholds": {
      "main": [
        [
          {
            "node": "Format Alert",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": false,
  "settings": {},
  "versionId": "1"
}

About this workflow

Cost Monitoring & Alerts. Uses httpRequest. Scheduled trigger; 6 nodes.

Source: https://github.com/jeremylongshore/Hybrid-ai-stack-intent-solutions/blob/f1cd251518a4afeb9dc8841b700851199340bc8a/workflows/cost_monitor.json — original creator credit. Request a take-down →

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