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* Server Process Metrics
*
* Tracks CPU and memory usage of the Node.js server process.
* Uses built-in process.cpuUsage() and process.memoryUsage() APIs.
*/
import { Logger } from "@shared/logger";
const logger = new Logger("ServerMetrics");
interface ProcessMetrics {
cpuPercent: number;
memoryUsedMB: number;
memoryTotalMB: number;
memoryPercent: number;
uptimeSeconds: number;
}
interface CpuUsageSample {
user: number;
system: number;
timestamp: number;
}
let previousCpuSample: CpuUsageSample | null = null;
/**
* Get current CPU and memory usage of the Node.js process
*/
export function getProcessMetrics(): ProcessMetrics {
const now = Date.now();
// Memory usage
const memUsage = process.memoryUsage();
const memoryUsedMB = memUsage.heapUsed / (1024 * 1024);
const memoryTotalMB = osTotalMemoryMB();
const memoryPercent = (memoryUsedMB / memoryTotalMB) * 100;
// CPU usage (requires two samples)
const cpuUsage = process.cpuUsage();
let cpuPercent = 0;
if (previousCpuSample !== null) {
const elapsedMs = now - previousCpuSample.timestamp;
const elapsedNs = elapsedMs * 1_000_000; // Convert to nanoseconds
const userDiff = cpuUsage.user - previousCpuSample.user;
const systemDiff = cpuUsage.system - previousCpuSample.system;
const totalDiff = userDiff + systemDiff;
// CPU percentage across all cores
cpuPercent = (totalDiff / elapsedNs) * 100;
}
// Store sample for next calculation
previousCpuSample = {
user: cpuUsage.user,
system: cpuUsage.system,
timestamp: now,
};
return {
cpuPercent,
memoryUsedMB,
memoryTotalMB,
memoryPercent,
uptimeSeconds: process.uptime(),
};
}
/**
* Get total system memory in MB
*/
function osTotalMemoryMB(): number {
return os.totalmem() / (1024 * 1024);
}
// Import os module
import os from "node:os";
/**
* Track compilation metrics (duration, queue wait time)
*/
export interface CompileMetrics {
compileCount: number;
compileTimeoutCount: number;
compileErrorCount: number;
avgCompileDurationMs: number;
avgQueueWaitTimeMs: number;
maxCompileDurationMs: number;
maxQueueWaitTimeMs: number;
}
class CompileMetricsTracker {
private compileCount = 0;
private compileTimeoutCount = 0;
private compileErrorCount = 0;
private totalCompileDurationMs = 0;
private totalQueueWaitTimeMs = 0;
private maxCompileDurationMs = 0;
private maxQueueWaitTimeMs = 0;
recordCompileStart(): number {
return Date.now();
}
recordCompileComplete(startTime: number, queueWaitTimeMs: number, success: boolean, timedOut: boolean): void {
const duration = Date.now() - startTime;
this.compileCount++;
this.totalCompileDurationMs += duration;
this.totalQueueWaitTimeMs += queueWaitTimeMs;
if (duration > this.maxCompileDurationMs) {
this.maxCompileDurationMs = duration;
}
if (queueWaitTimeMs > this.maxQueueWaitTimeMs) {
this.maxQueueWaitTimeMs = queueWaitTimeMs;
}
if (timedOut) {
this.compileTimeoutCount++;
}
if (!success) {
this.compileErrorCount++;
}
logger.debug(`[CompileMetrics] Compile completed: ${duration.toFixed(0)}ms (queue: ${queueWaitTimeMs.toFixed(0)}ms, success: ${success})`);
}
getMetrics(): CompileMetrics {
return {
compileCount: this.compileCount,
compileTimeoutCount: this.compileTimeoutCount,
compileErrorCount: this.compileErrorCount,
avgCompileDurationMs: this.compileCount > 0
? this.totalCompileDurationMs / this.compileCount
: 0,
avgQueueWaitTimeMs: this.compileCount > 0
? this.totalQueueWaitTimeMs / this.compileCount
: 0,
maxCompileDurationMs: this.maxCompileDurationMs,
maxQueueWaitTimeMs: this.maxQueueWaitTimeMs,
};
}
reset(): void {
this.compileCount = 0;
this.compileTimeoutCount = 0;
this.compileErrorCount = 0;
this.totalCompileDurationMs = 0;
this.totalQueueWaitTimeMs = 0;
this.maxCompileDurationMs = 0;
this.maxQueueWaitTimeMs = 0;
}
}
export const compileMetricsTracker = new CompileMetricsTracker();
/**
* Track WebSocket session metrics
*/
export interface WebSocketMetrics {
activeSessions: number;
runningSessions: number;
pausedSessions: number;
totalConnections: number;
totalDisconnections: number;
}
class WebSocketMetricsTracker {
private activeSessions = 0;
private runningSessions = 0;
private pausedSessions = 0;
private totalConnections = 0;
private totalDisconnections = 0;
onConnection(): void {
this.activeSessions++;
this.totalConnections++;
logger.debug(`[WebSocketMetrics] Connection: ${this.activeSessions} active, ${this.totalConnections} total`);
}
onDisconnection(): void {
this.activeSessions = Math.max(0, this.activeSessions - 1);
this.totalDisconnections++;
logger.debug(`[WebSocketMetrics] Disconnection: ${this.activeSessions} active, ${this.totalDisconnections} total`);
}
onSessionStart(): void {
this.runningSessions++;
this.pausedSessions = Math.max(0, this.pausedSessions - 1);
}
onSessionPause(): void {
this.runningSessions = Math.max(0, this.runningSessions - 1);
this.pausedSessions++;
}
onSessionStop(): void {
this.runningSessions = Math.max(0, this.runningSessions - 1);
}
getMetrics(): WebSocketMetrics {
return {
activeSessions: this.activeSessions,
runningSessions: this.runningSessions,
pausedSessions: this.pausedSessions,
totalConnections: this.totalConnections,
totalDisconnections: this.totalDisconnections,
};
}
reset(): void {
this.activeSessions = 0;
this.runningSessions = 0;
this.pausedSessions = 0;
this.totalConnections = 0;
this.totalDisconnections = 0;
}
}
export const webSocketMetricsTracker = new WebSocketMetricsTracker();
/** Operational thresholds used by the status endpoint and alerting adapters. */
export const OBSERVABILITY_THRESHOLDS = {
compileQueueWaitMs: 60_000,
compileDurationMs: 60_000,
runnerQueueMultiplier: 10,
processMemoryPercent: 90,
processCpuPercent: 90,
} as const;
export interface ObservabilityAlert {
code: string;
severity: "warning" | "critical";
message: string;
}
export interface ObservabilitySnapshot {
compileMetrics: CompileMetrics;
compileQueueDepth: number;
runnerQueueDepth: number;
runnerCapacity: number;
processMetrics: ProcessMetrics;
}
/** Evaluate stable, operator-facing alerts without coupling to a monitoring vendor. */
export function evaluateObservabilityAlerts(snapshot: ObservabilitySnapshot): ObservabilityAlert[] {
const alerts: ObservabilityAlert[] = [];
const { compileMetrics, processMetrics } = snapshot;
if (compileMetrics.compileTimeoutCount > 0) {
alerts.push({ code: "compile_timeout", severity: "critical", message: "At least one compile timed out" });
}
if (compileMetrics.maxQueueWaitTimeMs >= OBSERVABILITY_THRESHOLDS.compileQueueWaitMs) {
alerts.push({ code: "compile_queue_wait_high", severity: "warning", message: "Compile queue wait exceeded 60 seconds" });
}
if (compileMetrics.maxCompileDurationMs >= OBSERVABILITY_THRESHOLDS.compileDurationMs) {
alerts.push({ code: "compile_duration_high", severity: "warning", message: "Compile duration exceeded 60 seconds" });
}
if (snapshot.compileQueueDepth > 0) {
alerts.push({ code: "compile_queue_nonempty", severity: "warning", message: "Compile slots have queued work" });
}
if (snapshot.runnerCapacity > 0 && snapshot.runnerQueueDepth > snapshot.runnerCapacity * OBSERVABILITY_THRESHOLDS.runnerQueueMultiplier) {
alerts.push({ code: "runner_queue_high", severity: "warning", message: "Runner queue exceeds ten times runner capacity" });
}
if (processMetrics.memoryPercent >= OBSERVABILITY_THRESHOLDS.processMemoryPercent) {
alerts.push({ code: "process_memory_high", severity: "critical", message: "Process memory usage exceeded 90 percent" });
}
if (processMetrics.cpuPercent >= OBSERVABILITY_THRESHOLDS.processCpuPercent) {
alerts.push({ code: "process_cpu_high", severity: "warning", message: "Process CPU usage exceeded 90 percent" });
}
return alerts;
}
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