After the patch installation all the devices were showing down

Check if the device discovery is failed due to the following error "device connectivity disabled need to enable it in the application settings"

From the error message  , I see that all devices are showing as down, and the error messages indicate that device connectivity is disabled. 

Follow the steps below to enable it

1. On the Junos Space Network Management Platform GUI, select Administration>Applications. The Applications page is displayed.
2. Click Network Management Platform and select Modify Application Settings from the Actions menu. Alternatively, right-click Network Management Platform and select Modify Application Settings. (The Modify Application Settings (Modify Network Management Platform Settings) page is displayed and the Device section is selected by default).
3. Check the Allow Device Communication is enabled. If not enabled try to enable it.
4. Select the Allow Device Communication check box. 
5. Click Modify to modify the settings.

Note : If you face any issues, please contact JUNIPER JTAC Support for assistance.