updates

server/remote-health-json

@@ -5,6 +5,15 @@ No third-party Python packages required.
 """
 import datetime
 import json
+
+def system_uptime_seconds():
+    """Read Linux kernel uptime without privilege or external commands."""
+    try:
+        with open('/proc/uptime', encoding='ascii') as handle:
+            return max(0, int(float(handle.read().split()[0])))
+    except (OSError, ValueError, IndexError):
+        return None
+
 import os
 import shutil
 import socket
@@ -115,4 +124,5 @@ for section in dict.fromkeys(c['section'] for c in checks):
 counts = {s: sum(c['status'] == s for c in checks) for s in ('ok', 'warn', 'fail')}
 overall = 'fail' if counts['fail'] else 'warn' if counts['warn'] else 'ok'
 print(json.dumps(dict(schema=1, host=host, generatedAt=datetime.datetime.now(datetime.timezone.utc).isoformat(),
-                      overall=overall, counts=counts, groups=groups, checks=checks, diagnostics=None, services=services)))
+                      overall=overall, counts=counts, groups=groups, checks=checks, diagnostics=None, services=services,
+                      uptimeSeconds=system_uptime_seconds())))