Add resilient upload queue and client health

docs/ocsentinel-deployment.md

@@ -46,6 +46,24 @@ automation read access. Set it to `true` for a device to begin the five-minute
 burst scans; clear it to stop them. The normal daily scan continues regardless
 of the checkbox.
 
+## Upload Reliability And Client Health
+
+If the upload endpoint is temporarily unavailable, the client stores up to 100
+signed report payloads locally under `C:\ProgramData\OCSentinel\upload-queue`.
+The next scheduled run sends queued payloads before its new report. The local
+health state is stored under `C:\ProgramData\OCSentinel\state`.
+
+Create these additional device custom fields in NinjaOne and allow automation
+write access:
+
+| Field name | Type | Purpose |
+| --- | --- | --- |
+| `ocsentineluploadstatus` | Text | `ok`, `queued`, or `unknown` upload state |
+| `ocsentinelqueuedreports` | Integer | Reports waiting for delivery |
+| `ocsentinellastuploadutc` | Date/Time | Last successful upload time |
+| `ocsentinellasterror` | Text | Last upload error, if any |
+| `ocsentinelclientversion` | Text | Installed client version |
+
 ## NinjaOne Tasks
 
 Create a PowerShell script in NinjaOne named `OCSentinel - Installieren oder aktualisieren`.