get_metrics
Retrieve server performance metrics to monitor system health and optimize resource allocation for memory management operations.
Instructions
獲取服務器性能指標
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
No arguments | |||
Implementation Reference
- src/index.js:191-193 (handler)Handler function for the 'get_metrics' MCP tool. It executes the tool logic by calling globalMetrics.getMetrics() to retrieve comprehensive server performance metrics.
async handler() { return globalMetrics.getMetrics(); } - src/index.js:186-194 (registration)Registration of the 'get_metrics' tool in the tool registry. Includes name, description, empty input schema (no parameters), system scope, and inline handler.
registerTool({ name: 'get_metrics', description: '獲取服務器性能指標', inputSchema: z.object({}), scope: 'system', async handler() { return globalMetrics.getMetrics(); } }, 'system'); - src/index.js:189-189 (schema)Zod input schema for the 'get_metrics' tool: empty object schema indicating no input parameters are required.
inputSchema: z.object({}), - src/monitoring/metrics.js:130-194 (helper)Core implementation of getMetrics() method in MetricsCollector class. Computes and returns detailed performance metrics: uptime, request counts/error rates, latency percentiles (p50/p95/p99), cache statistics, memory usage, and tool-specific stats.
getMetrics() { const now = Date.now(); const uptime = now - this.startTime; const uptimeSeconds = Math.floor(uptime / 1000); // 計算請求率 const requestsPerSecond = this.requestCount / (uptimeSeconds || 1); // 計算錯誤率 const errorRate = this.requestCount > 0 ? (this.errorCount / this.requestCount * 100).toFixed(2) : 0; // 計算持續時間統計 const avgDuration = this.durations.length > 0 ? this.durations.reduce((sum, d) => sum + d, 0) / this.durations.length : 0; // 計算緩存命中率 const totalCacheAccess = this.cacheHits + this.cacheMisses; const cacheHitRate = totalCacheAccess > 0 ? (this.cacheHits / totalCacheAccess * 100).toFixed(2) : 0; // 獲取最新內存使用 const latestMemory = this.memorySnapshots.length > 0 ? this.memorySnapshots[this.memorySnapshots.length - 1] : process.memoryUsage(); return { uptime: { ms: uptime, seconds: uptimeSeconds, human: this.formatUptime(uptimeSeconds) }, requests: { total: this.requestCount, success: this.successCount, error: this.errorCount, errorRate: `${errorRate}%`, requestsPerSecond: requestsPerSecond.toFixed(2) }, latency: { avg: avgDuration.toFixed(2), p50: percentile(this.durations, 0.50).toFixed(2), p95: percentile(this.durations, 0.95).toFixed(2), p99: percentile(this.durations, 0.99).toFixed(2), max: this.durations.length > 0 ? Math.max(...this.durations).toFixed(2) : 0, unit: 'ms' }, cache: { hits: this.cacheHits, misses: this.cacheMisses, total: totalCacheAccess, hitRate: `${cacheHitRate}%` }, memory: { rss: `${(latestMemory.rss / 1024 / 1024).toFixed(2)} MB`, heapTotal: `${(latestMemory.heapTotal / 1024 / 1024).toFixed(2)} MB`, heapUsed: `${(latestMemory.heapUsed / 1024 / 1024).toFixed(2)} MB`, external: `${(latestMemory.external / 1024 / 1024).toFixed(2)} MB` }, toolStats: this.getToolStats() }; }