docs: off1 exim panic log (#253)

docs/logs-off1.md

@@ -3,6 +3,17 @@
 Report here the timeline of incidents and interventions on off1 server.
 Keep things short or write a report.
 
+## 2023-09-05 exim paniclog
+
+We have an alert since 09-03 because `/var/log/exim4/paniclog` is not empty.
+Indeed it has a line saying `2023-09-03 04:17:57 daemon: fork of queue-runner process failed: Cannot allocate memory`
+But appart from this it's all ok. Alert will remain until this paniclog is empty.
+I did a:
+```bash
+cd /var/log/exim4; mv paniclog paniclog.1; systemctl reload exim4
+```
+
+
 ## 2023-07-25 Disk full on /rpool/off/products
 
-See [2023-07-26 rpool/off/products dataset full on off1](reports/2023-07-26-rpool-off-products-full.md)
+See [2023-07-26 rpool/off/products dataset full on off1](reports/2023-07-26-rpool-off-products-full.md)