Add sample PSU log messages to Dedicated HSM docs

Author: msmbaldwin

articles/dedicated-hsm/monitoring.md

@@ -29,7 +29,14 @@ Depending on the nature of the issue, the appropriate course of action would be
 
 The Thales Luna 7 HSM device uses a dual power supply unit (PSU) design for redundancy. Each PSU connects to an independent power feed, allowing the device to operate normally if one PSU experiences a brief outage.
 
-During scheduled datacenter power maintenance, you may see transient single-PSU outage or restore messages in your HSM logs. These messages are expected behavior and don't indicate a hardware fault—the device continues operating normally on the redundant PSU.
+During scheduled datacenter power maintenance, power feeds are serviced one at a time while the other feed remains active, ensuring continuous operation through redundant power. You may see transient single-PSU messages in your HSM logs such as:
+
+```text
+Power supply 1 AC outage
+Power supply 1 AC restored
+```
+
+These messages are expected behavior and don't indicate a hardware fault—the device continues operating normally on the redundant PSU.
 
 > [!IMPORTANT]
 > Don't open support tickets or request physical hardware investigation based on single-PSU log messages. Microsoft monitors PSU health and proactively addresses any actual hardware failures. Unnecessary physical intervention can introduce risk to your device's operation.