HTTPとメールアラートによるサーバー自動健康チェック

• •OpenAI API Key

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        "text": "=You are an AI system report generator. You will receive raw SSH output from a Linux server. Your task is to generate a structured system report with actionable recommendations, prioritization, and an executive summary.\n\nOutput JSON must strictly follow this schema:\n\n{\n  \"executiveSummary\": string,\n  \"summary\": string,\n  \"details\": string,\n  \"status\": string, // OK, WARNING, CRITICAL\n  \"recommendations\": [\n    {\n      \"issue\": string,\n      \"priority\": string, // HIGH, MEDIUM, LOW\n      \"action\": string\n    }\n  ]\n}\n\nRequirements:\n1. Executive Summary: 2–3 lines for management, highlighting critical issues and overall system health.\n2. Summary: concise technical overview of CPU, memory, disk, network, and critical processes.\n3. Details: generate a professional, modern HTML report. Include tables, inline styles, colored highlights, simple inline graphs, and actionable recommendations.\n4. Recommendations: list each issue detected, assign a priority (HIGH/MEDIUM/LOW), and suggest a specific action.\n5. Status: determine overall system health based on thresholds (CPU >80%, memory <10% free, disk >90%, network saturation >80%, top processes consuming high CPU).\n6. Return only JSON matching the schema. Do not add extra fields.\n\nHere is the raw SSH output:\n\n {{ $json.stdout }}",
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        "content": "## Automated Server Health Check with AI & Email Alerts\n\n## **Purpose:**\nThis workflow automatically gathers **system health data** from a server, analyzes it using an AI Agent, and sends **email alerts** if anything unusual is detected. It’s ideal for DevOps teams or sysadmins who want an automated health check without installing heavy monitoring software.\n\n## **How it works:**\n\n1. **Schedule Trigger** – Runs the workflow at set intervals (e.g., every 5 minutes).\n2. **Execute Command** – Runs shell commands to collect system info, CPU, memory, disk usage, running services, network stats, and top processes:\n\n   * `echo \"---SYSTEM INFO---\"; hostname; uptime;` → Server identity and uptime\n   * `echo \"---CPU---\"; top -bn1 | grep \"Cpu(s)\";` → CPU usage\n   * `echo \"---MEMORY---\"; free -m;` → Memory usage in MB\n   * `echo \"---DISK---\"; df -h;` → Disk usage\n   * `echo \"---SERVICES---\"; systemctl list-units --type=service --state=running;` → Running services\n   * `echo \"---NETWORK---\"; ip -s link;` → Network interface stats\n   * `echo \"---TOP PROCESSES---\"; ps -eo pid,comm,%cpu,%mem --sort=-%cpu | head -n 10` → Top 10 CPU-consuming processes\n3. **AI Agent** – Analyzes command outputs to detect anomalies or potential issues.\n4. **Structured Output Parser** – Formats AI output so it can be used for email alerts.\n5. **Send Email** – Notifies recipients with server health summary or detected issues.\n\n## **Setup Instructions:**\n\n* Replace the commands in the **Execute Command node** if you want custom server checks.\n* Configure the **Azure OpenAI Chat** node with your API credentials in n8n credentials.\n* Update the **Email node** with your SMTP credentials and recipient addresses.\n* Adjust the **Schedule Trigger** interval according to your monitoring needs.\n\n## **Notes:**\n\n* All credentials should be stored securely; do **not hardcode API keys**.\n* Multiple servers can be monitored by adding more command nodes or duplicating the workflow.\n* Suitable for Self-Hosted Instances also."
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        "content": "**Schedule Trigger:**\n   *“Triggers the workflow at your chosen interval to run server health checks automatically.”*"
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        "content": "**Execute Command:**\n   *“Collects detailed server metrics: hostname, uptime, CPU, memory, disk, services, network stats, and top processes.”*"
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        "content": "**AI Agent:**\n   *“Analyzes the collected server data for anomalies and prepares structured results.”*\n"
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        "content": "**Structured Output Parser:**\n   *“Ensures AI output is formatted correctly for the email alert.”*"
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        "content": "\n\n**Send Email:**\n   *“Sends an alert email summarizing the server health or any detected issues.”*"
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