incidents: add incident 019 about broken ssh on ap-0b99

documentation/INCIDENTS.md

@@ -923,3 +923,21 @@ I don't know if the social worker container still had power.
 
 **todos**:
 * [ ] get acknowledgement that power outage happend
+
+
+019 2022.09.26 01:00 | ap-0b99 unreachable via ssh
+--------------------------------------------------
+
+While trying to uprade the firmware on ap-0b99 (future incident which will be linked) I was unable to ssh into the ap.
+`ssh -v` revealed that an successfull ssh handshake happend but afterwards `ap-0b99` immediatly closed the connection.
+
+`monitoring01` was still able to scrape the target.
+Therefore my plan was to collect logs via the serial console on my next visit.
+
+The recent power outages (see `incident 018` for details) destroyed the logs.
+
+**impact**:
+* earliest occurence: 2022.09.26 ~01:00
+* till:               2022.09.26 ~15:30
+* maybe just an issue with the management plane
+* possibly also an issue with the forwarding plane and wifi stuff