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Badges\n\n[![Build Status](https://github.com/petaki/satellite/workflows/tests/badge.svg)](https://github.com/petaki/satellite/actions)\n[![License: MIT](https://img.shields.io/badge/License-MIT-brightgreen.svg)](LICENSE.md)\n\n## MCP Server\n\nSatellite includes a built-in [MCP](https://modelcontextprotocol.io) (Model Context Protocol) server that lets AI agents query your monitoring data directly. When enabled, it exposes a Streamable HTTP endpoint with tools for listing probes, querying CPU/memory/load/disk metrics, reading logs, checking alerts, and managing probes.\n\nAdd it to your MCP client:\n\n```bash\n# Claude Code\nclaude mcp add --transport http satellite http://127.0.0.1:4000/mcp\n\n# Codex\ncodex mcp add satellite --url http://127.0.0.1:4000/mcp\n```\n\n| Tool | Description |\n|------|-------------|\n| `list_probes` | List all probes with status, latest metrics, and alarm thresholds |\n| `get_cpu` | CPU usage time series with top 3 processes |\n| `get_memory` | Memory usage time series with top 3 processes |\n| `get_load` | Load average time series (1m, 5m, 15m) |\n| `get_disk` | Disk usage time series with path selector |\n| `get_logs` | Log entries with log file path selector |\n| `get_alerts` | Alarm thresholds and current metric values |\n| `delete_probe` | Delete a probe and all its data |\n\nEnable it by setting `MCP_ENABLED=true` in your `.env` file.\n\n## Features\n\n- **MCP Server** - AI agent access to all monitoring data via Model Context Protocol\n- **CPU** - overall and per-process CPU usage charts\n- **Memory** - overall and per-process memory usage charts\n- **Load** - system load averages (1, 5, 15 min) charts\n- **Disk** - per-partition disk usage charts with path selector\n- **Log Viewer** - browse log tail entries collected by Probe\n- **Dark Mode** - full dark mode support\n- **Heartbeat** - webhook notifications when a probe goes offline\n- **Series Filtering** - configurable time range buttons (5 min to 30 days)\n\n## Getting Started\n\nFollow the steps below to install and configure Satellite.\n\n### Prerequisites\n\n- Redis: `Version \u003e= 5.0` for data reading\n\n### Run with Docker\n\nImage can be found at the package page on [GitHub](https://github.com/petaki/satellite/pkgs/container/satellite).\n\n```bash\ndocker run --rm \\\n-e APP_URL=http://127.0.0.1:4000 \\\n-e REDIS_URL=redis://192.168.0.200:6379/0 \\\n-p 4000:4000 \\\nghcr.io/petaki/satellite\n```\n\n### Install from Binary\n\nDownload the latest release for your platform from the [GitHub Releases](https://github.com/petaki/satellite/releases) page.\n\n---\n\n### Install from Source\n\n#### Prerequisites\n\n- Go: `Version \u003e= 1.26`\n- Node.js: `Version \u003e= 22.0`\n- Yarn or NPM\n\n#### Steps\n\n1. Clone the repository:\n\n```bash\ngit clone git@github.com:petaki/satellite.git\n```\n\n2. Install UI dependencies and build:\n\n```bash\ncd satellite\nyarn install\nyarn build\n```\n\n3. Build the binary:\n\n```bash\ngo build\n```\n\n4. Copy and edit the configuration:\n\n```bash\ncp .env.example .env\n```\n\n## Configuration\n\nAll configuration is done through environment variables in the `.env` file.\n\n### General\n\n#### Application Name\n\n```\nAPP_NAME=\n```\n\n#### Application Address\n\n```\nAPP_ADDR=:4000\n```\n\n#### Application URL\n\n```\nAPP_URL=http://127.0.0.1:4000\n```\n\n#### Application Series Buttons\n\n- Maximum `4` items.\n- The first item is the `default`.\n- The order does not matter from the second item.\n\n```\nAPP_SERIES_BUTTONS=last_5_minutes,last_1_hour,last_24_hours,last_7_days\n```\n\nAvailable options:\n\n| Option | Description |\n|--------|-------------|\n| `last_5_minutes` | Last 5 minutes |\n| `last_15_minutes` | Last 15 minutes |\n| `last_30_minutes` | Last 30 minutes |\n| `last_1_hour` | Last 1 hour |\n| `last_3_hours` | Last 3 hours |\n| `last_6_hours` | Last 6 hours |\n| `last_12_hours` | Last 12 hours |\n| `last_24_hours` | Last 24 hours |\n| `last_2_days` | Last 2 days |\n| `last_7_days` | Last 7 days |\n| `last_30_days` | Last 30 days |\n\n---\n\n### Redis\n\n#### Redis URL\n\n```\nREDIS_URL=redis://127.0.0.1:6379/0\n```\n\n---\n\n### MCP\n\nExposes monitoring data to AI agents via the Model Context Protocol. No authentication is included — control access at the network level.\n\n#### MCP Enabled\n\n```\nMCP_ENABLED=false\n```\n\n---\n\n### Heartbeat\n\nSends webhook notifications when a probe stops reporting. Requires Redis to be configured.\n\n#### Heartbeat Enabled\n\n```\nHEARTBEAT_ENABLED=false\n```\n\n#### Heartbeat Wait (in minutes before first notification)\n\n```\nHEARTBEAT_WAIT=5\n```\n\n#### Heartbeat Sleep (in seconds between notifications)\n\nSet to `0` to disable.\n\n```\nHEARTBEAT_SLEEP=300\n```\n\n---\n\n### Heartbeat Webhook\n\n#### Heartbeat Webhook Method\n\n```\nHEARTBEAT_WEBHOOK_METHOD=POST\n```\n\n#### Heartbeat Webhook URL\n\n```\nHEARTBEAT_WEBHOOK_URL=http://127.0.0.1:4000/heartbeat\n```\n\n#### Heartbeat Webhook Header\n\n```\nHEARTBEAT_WEBHOOK_HEADER='{\"Authorization\": \"Bearer TOKEN\", \"Accept\": \"application/json\"}'\n```\n\n#### Heartbeat Webhook Body\n\nThe body supports the following placeholders:\n\n| Placeholder | Description |\n|-------------|-------------|\n| `%p` | Probe name |\n| `%t` | Timestamp (`RFC3339`) |\n| `%x` | Timestamp (`Unix`) |\n| `%l` | Satellite link (relative) |\n\n```\nHEARTBEAT_WEBHOOK_BODY='{\"probe\": \"%p\", \"timestamp_rfc3339\": \"%t\", \"timestamp_unix\": %x, \"link\": \"%l\"}'\n```\n\n## Usage\n\n```bash\n./satellite web serve\n```\n\n## Data Collection\n\nCollected data is provided by [Probe](https://github.com/petaki/probe).\n\n## Contributors\n\n- [@dyipon](https://github.com/dyipon) - development ideas, bug reports and testing\n\n## Reporting Issues\n\nIf you are facing a problem with this package or found any bug, please open an issue on [GitHub](https://github.com/petaki/satellite/issues).\n\n## License\n\nThe MIT License (MIT). 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