Apple notes observability

Apple Notes Observability

Overview

Apple Notes has no built-in metrics API or health endpoint. Observability must be built from the outside: polling note counts and folder states via JXA, monitoring iCloud sync daemon health, tracking osascript response latency, and watching system logs for Notes-related errors. This guide sets up a lightweight monitoring stack using bash scripts, structured JSON logs, and macOS notifications for alerting. For persistent monitoring, deploy the health check as a launchd agent that runs on a schedule.

Health Check Script

#!/bin/bash
# scripts/notes-health-check.sh — Deploy via launchd (every 5 minutes)
LOG_FILE="${NOTES_LOG_DIR:-/tmp}/notes-health.jsonl"

timestamp=$(date -Iseconds)
notes_running=$(pgrep -x Notes > /dev/null && echo "true" || echo "false")

# Measure JXA latency
start_ms=$(($(date +%s%N)/1000000))
note_count=$(osascript -l JavaScript -e 'Application("Notes").defaultAccount.notes.length' 2>/dev/null || echo "-1")
folder_count=$(osascript -l JavaScript -e 'Application("Notes").defaultAccount.folders.length' 2>/dev/null || echo "-1")
account_count=$(osascript -l JavaScript -e 'Application("Notes").accounts().length' 2>/dev/null || echo "-1")
end_ms=$(($(date +%s%N)/1000000))
latency_ms=$((end_ms - start_ms))

# iCloud sync daemon status
bird_running=$(pgrep -x bird > /dev/null && echo "true" || echo "false")
cloudd_running=$(pgrep -x cloudd > /dev/null && echo "true" || echo "false")

# Determine health
healthy="true"
[ "$notes_running" = "false" ] && healthy="false"
[ "$note_count" = "-1" ] && healthy="false"
[ "$latency_ms" -gt 10000 ] && healthy="false"

echo "{\"ts\":\"$timestamp\",\"running\":$notes_running,\"notes\":$note_count,\"folders\":$folder_count,\"accounts\":$account_count,\"latency_ms\":$latency_ms,\"bird\":$bird_running,\"cloudd\":$cloudd_running,\"healthy\":$healthy}" >> "$LOG_FILE"

# Alert on unhealthy state
if [ "$healthy" = "false" ]; then
  osascript -e "display notification \"Notes health check failed (notes=$note_count, latency=${latency_ms}ms)\" with title \"Notes Alert\""
fi

Metrics Dashboard (CLI)

#!/bin/bash
# scripts/notes-dashboard.sh — Quick view of recent health data
LOG_FILE="${NOTES_LOG_DIR:-/tmp}/notes-health.jsonl"

echo "=== Apple Notes Health Dashboard ==="
echo "Last 10 checks:"
tail -10 "$LOG_FILE" | jq -r '"\(.ts) | notes=\(.notes) | folders=\(.folders) | latency=\(.latency_ms)ms | healthy=\(.healthy)"'

echo ""
echo "=== Trend (note count, last 24h) ==="
# Show note count changes
awk -F'"notes":' '{split($2,a,","); print a[1]}' "$LOG_FILE" | tail -48 | sort -u

echo ""
echo "=== Alerts (unhealthy checks) ==="
grep '"healthy":false' "$LOG_FILE" | tail -5 | jq -r '"\(.ts): notes=\(.notes), latency=\(.latency_ms)ms"'

Structured Metrics Collection

// src/observability/metrics.ts
import { execSync } from "child_process";
import { appendFileSync } from "fs";

interface NotesMetrics {
  timestamp: string;
  noteCount: number;
  folderCount: number;
  accountCount: number;
  latencyMs: number;
  healthy: boolean;
  icloudSyncActive: boolean;
}

function collectMetrics(): NotesMetrics {
  const start = Date.now();
  try {
    const output = execSync(
      `osascript -l JavaScript -e 'JSON.stringify({n: Application("Notes").defaultAccount.notes.length, f: Application("Notes").defaultAccount.folders.length, a: Application("Notes").accounts().length})'`,
      { encoding: "utf8", timeout: 15000 }
    );
    const data = JSON.parse(output);
    const bird = execSync("pgrep -x bird > /dev/null && echo 1 || echo 0", { encoding: "utf8" }).trim();
    return {
      timestamp: new Date().toISOString(), noteCount: data.n, folderCount: data.f,
      accountCount: data.a, latencyMs: Date.now() - start, healthy: true,
      icloudSyncActive: bird === "1",
    };
  } catch {
    return {
      timestamp: new Date().toISOString(), noteCount: 0, folderCount: 0,
      accountCount: 0, latencyMs: Date.now() - start, healthy: false,
      icloudSyncActive: false,
    };
  }
}

Error Handling

Issue	Cause	Solution
Latency spikes >10s	Notes.app indexing or large iCloud sync	Transient; alert only if sustained over 3 consecutive checks
Note count drops to 0	iCloud account signed out or TCC revoked	Check defaults read MobileMeAccounts; re-authenticate
bird process not running	iCloud daemon crashed	killall bird triggers automatic restart by launchd
Health check script fails	osascript timeout	Add timeout 15 prefix to osascript calls
Log file grows unbounded	No rotation configured	Add logrotate config or truncate weekly via launchd

Resources

• macOS Unified Logging
• launchd.plist Reference
• Mac Automation Scripting Guide

Next Steps

For alerting on incidents detected by monitoring, see apple-notes-incident-runbook. For performance optimization when metrics show slowdowns, see apple-notes-performance-tuning.