feat(monitoring): add edge-triggered threshold handling with group action orchestration and HA-aware Proxmox shutdowns

ts/actions/shutdown-action.ts

@@ -15,6 +15,7 @@ const execFileAsync = promisify(execFile);
  */
 export class ShutdownAction extends Action {
   readonly type = 'shutdown';
+  private static scheduledDelayMinutes: number | null = null;
 
   /**
    * Override shouldExecute to add shutdown-specific safety checks
@@ -126,6 +127,25 @@ export class ShutdownAction extends Action {
 
     const shutdownDelay = this.config.shutdownDelay ?? SHUTDOWN.DEFAULT_DELAY_MINUTES;
 
+    if (
+      ShutdownAction.scheduledDelayMinutes !== null &&
+      ShutdownAction.scheduledDelayMinutes <= shutdownDelay
+    ) {
+      logger.info(
+        `Shutdown action skipped: shutdown already scheduled in ${ShutdownAction.scheduledDelayMinutes} minutes`,
+      );
+      return;
+    }
+
+    if (
+      ShutdownAction.scheduledDelayMinutes !== null &&
+      ShutdownAction.scheduledDelayMinutes > shutdownDelay
+    ) {
+      logger.warn(
+        `Shutdown already scheduled in ${ShutdownAction.scheduledDelayMinutes} minutes, rescheduling to ${shutdownDelay} minutes`,
+      );
+    }
+
     logger.log('');
     logger.logBoxTitle('Initiating System Shutdown', UI.WIDE_BOX_WIDTH, 'error');
     logger.logBoxLine(`UPS: ${context.upsName} (${context.upsId})`);
@@ -139,6 +159,7 @@ export class ShutdownAction extends Action {
 
     try {
       await this.executeShutdownCommand(shutdownDelay);
+      ShutdownAction.scheduledDelayMinutes = shutdownDelay;
     } catch (error) {
       logger.error(
         `Shutdown command failed: ${error instanceof Error ? error.message : String(error)}`,
@@ -227,6 +248,7 @@ export class ShutdownAction extends Action {
           logger.log(`Trying alternative shutdown method: ${cmdPath} ${alt.args.join(' ')}`);
           await execFileAsync(cmdPath, alt.args);
           logger.log(`Alternative method ${alt.cmd} succeeded`);
+          ShutdownAction.scheduledDelayMinutes = 0;
           return; // Exit if successful
         }
       } catch (_altError) {