How to troubleshoot if device reboots due to unknown reason in Prisma SD-WAN

• The device reboots without any manual intervention.
• Reboot reason shows as "unknown" in the logs and alerts.

• Prisma SD-WAN
• ION devices 
• Power Supply

1. Login to the SDWAN Portal.
2. Under the "Events" tab, check for the alert "DEVICE REBOOT".
3. The reboots are logged in the events log.
4. Run the CLI command "debug logs dump event | grep "reboot". This will give the reason for reboot.

event:{"_ts":"2021-04-14T14:13:58.631Z","_level":"info","_pid":1595,"_msgid":"reboot","_prog":"evd","_fac":"event","_thread":"main","value":"{\"info\":{\"reason\":\"unknown\",\"detail\":\"\"},\"ident\":\"system\",\"level\":\"critical\",\"timestamp\":\"2021-04-14T14:13:58.577Z\",\"code\":\"DEVICESW_SYSTEM_BOOT\",\"type\":\"alert\",\"site_id\":\"16085738821740117\"}"}

event:{"_ts":"2021-04-14T14:42:23.433Z","_level":"info","_pid":1592,"_msgid":"reboot","_prog":"evd","_fac":"event","_thread":"main","value":"{\"info\":{\"reason\":\"unknown\",\"detail\":\"\"},\"ident\":\"system\",\"level\":\"critical\",\"timestamp\":\"2021-04-14T14:42:23.379Z\",\"code\":\"DEVICESW_SYSTEM_BOOT\",\"type\":\"alert\",\"site_id\":\"16085738821740117\"}"}

5. The voltage and temperature can be checked using "dump sensor type=temperature type=voltage" Verify if any abnormal surge is seen.
   

   ION1# dump sensor type=temperature type=voltage
   time       core0   core1   core2   core3   sys
              (°C)    (°C)    (°C)    (°C)    (°C)
   
   T13:54:12     33      32      33      33      45
   T14:09:12     32      32      33      33      45
   T14:15:59     32      32      33      33      45
   T14:30:59     33      32      33      33      45
   
   time         1v      5v      vcore   vddr    core0   core1   core2   core3   sys
                (mV)    (mV)    (mV)    (mV)    (°C)    (°C)    (°C)    (°C)    (°C)
   
   T14:09:12     1008    5056    984     1520    32      32      33      33      45
   T14:15:59     1008    5056    992     1520    32      32      33      33      45
   T14:30:59     1008    5056    992     1520    33      32      33      33      45

6. The above procedure/commands help to identify if the reboot is due to power fluctuation or mistakenly disturbed the power socket.

Using backup power such as dual power supply options will help avoid such issues.