ops: add syserr triage views

docs/server-management.md

@@ -35,6 +35,8 @@ The Debian deployment installs:
 - showing an operational summary
 - showing recent auth success/failure activity
 - showing auth activity grouped by source IP
+- showing recent `syserr.log` entries
+- summarizing recurring `syserr.log` entries
 - viewing inventory
 - listing managed units
 - checking service status
@@ -99,6 +101,18 @@ Show auth activity grouped by IP:
 metinctl auth-ips
 ```
 
+Show the latest runtime errors collected from all `syserr.log` files:
+
+```bash
+metinctl recent-errors
+```
+
+Show the most repeated runtime errors in the last 24 hours:
+
+```bash
+metinctl error-summary
+```
+
 Include smoke-test failures too:
 
 ```bash