feat(processmonitor): Add CPU monitoring and display CPU in process list

ts/daemon/processmonitor.ts

@@ -24,6 +24,8 @@ export class ProcessMonitor extends EventEmitter {
   private lastRetryAt: number | null = null;
   private readonly MAX_RETRIES = 10;
   private readonly RESET_WINDOW_MS = 60 * 60 * 1000; // 1 hour
+  private lastMemoryUsage: number = 0;
+  private lastCpuUsage: number = 0;
 
   constructor(config: IMonitorConfig & { id?: ProcessId }) {
     super();
@@ -260,12 +262,16 @@ export class ProcessMonitor extends EventEmitter {
     memoryLimit: number,
   ): Promise<void> {
     try {
-      const memoryUsage = await this.getProcessGroupMemory(pid);
+      const { memory: memoryUsage, cpu: cpuUsage } = await this.getProcessGroupStats(pid);
 
       this.logger.debug(
         `Memory usage for PID ${pid}: ${this.humanReadableBytes(memoryUsage)} (${memoryUsage} bytes)`,
       );
 
+      // Store latest readings
+      this.lastMemoryUsage = memoryUsage;
+      this.lastCpuUsage = cpuUsage;
+
       // Only log memory usage in debug mode to avoid spamming
       if (process.env.TSPM_DEBUG) {
         this.log(
@@ -303,7 +309,7 @@ export class ProcessMonitor extends EventEmitter {
   /**
    * Get the total memory usage (in bytes) for the process group (the main process and its children).
    */
-  private getProcessGroupMemory(pid: number): Promise<number> {
+  private getProcessGroupStats(pid: number): Promise<{ memory: number; cpu: number }> {
     return new Promise((resolve, reject) => {
       this.logger.debug(
         `Getting memory usage for process group with PID ${pid}`,
@@ -333,7 +339,7 @@ export class ProcessMonitor extends EventEmitter {
 
           plugins.pidusage(
             pids,
-            (err: Error | null, stats: Record<string, { memory: number }>) => {
+            (err: Error | null, stats: Record<string, { memory: number; cpu: number }>) => {
               if (err) {
                 const processError = new ProcessError(
                   `Failed to get process usage stats: ${err.message}`,
@@ -345,14 +351,16 @@ export class ProcessMonitor extends EventEmitter {
               }
 
               let totalMemory = 0;
+              let totalCpu = 0;
               for (const key in stats) {
                 totalMemory += stats[key].memory;
+                totalCpu += Number.isFinite(stats[key].cpu) ? stats[key].cpu : 0;
               }
 
               this.logger.debug(
                 `Total memory for process group: ${this.humanReadableBytes(totalMemory)}`,
               );
-              resolve(totalMemory);
+              resolve({ memory: totalMemory, cpu: totalCpu });
             },
           );
         },
@@ -448,6 +456,20 @@ export class ProcessMonitor extends EventEmitter {
     return this.processWrapper?.isRunning() || false;
   }
 
+  /**
+   * Get last measured memory usage for the process group (bytes)
+   */
+  public getLastMemoryUsage(): number {
+    return this.lastMemoryUsage;
+  }
+
+  /**
+   * Get last measured CPU usage for the process group (sum of group, percent)
+   */
+  public getLastCpuUsage(): number {
+    return this.lastCpuUsage;
+  }
+
   /**
    * Helper method for logging messages with the instance name.
    */