Checkmk discovers only 2 of 4 power supplies on Juniper switch

Troubleshooting
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4

I would also say this is a software problem on the device.
Your snmpwalk only shows two PSUs.

iso.3.6.1.4.1.2636.3.1.15.1.5.2.1.1.0 = STRING: "Power Supply 0"
iso.3.6.1.4.1.2636.3.1.15.1.5.2.1.2.0 = STRING: "Power Supply 1"
iso.3.6.1.4.1.2636.3.1.15.1.5.4.1.1.0 = STRING: "Fan Tray 0 Fan 0"
iso.3.6.1.4.1.2636.3.1.15.1.5.4.1.2.0 = STRING: "Fan Tray 0 Fan 1"
iso.3.6.1.4.1.2636.3.1.15.1.5.4.1.3.0 = STRING: "Fan Tray 0 Fan 2"

If you have support on this devices it would be a good time to make a support ticket :smiley: