diff --git a/xyz/openbmc_project/Sensor/Threshold/Critical.interface.yaml b/xyz/openbmc_project/Sensor/Threshold/Critical.interface.yaml
index 9dea127..1c8b4bc 100644
--- a/xyz/openbmc_project/Sensor/Threshold/Critical.interface.yaml
+++ b/xyz/openbmc_project/Sensor/Threshold/Critical.interface.yaml
@@ -42,3 +42,36 @@
 
           CriticalAlarmLow may be set to False to clear an alarm condition.
           The behavior of setting CriticalAlarmLow to True is undefined.
+signals:
+    - name: CriticalHighAlarmAsserted
+      description: >
+          The high threshold alarm asserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: CriticalHighAlarmDeasserted
+      description: >
+          The high threshold alarm deasserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: CriticalLowAlarmAsserted
+      description: >
+          The low threshold alarm asserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: CriticalLowAlarmDeasserted
+      description: >
+          The low threshold alarm deasserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
diff --git a/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml b/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
index bf6c4fd..4987414 100644
--- a/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
+++ b/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
@@ -45,3 +45,37 @@
 
           HardShutdownAlarmLow may be set to False to clear an alarm condition.
           The behavior of setting HardShutdownAlarmLow to True is undefined.
+
+signals:
+    - name: HardShutdownHighAlarmAsserted
+      description: >
+          The high threshold alarm asserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: HardShutdownHighAlarmDeasserted
+      description: >
+          The high threshold alarm deasserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: HardShutdownLowAlarmAsserted
+      description: >
+          The low threshold alarm asserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: HardShutdownLowAlarmDeasserted
+      description: >
+          The low threshold alarm deasserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
diff --git a/xyz/openbmc_project/Sensor/Threshold/PerformanceLoss.interface.yaml b/xyz/openbmc_project/Sensor/Threshold/PerformanceLoss.interface.yaml
index 343f648..0c6c9e9 100644
--- a/xyz/openbmc_project/Sensor/Threshold/PerformanceLoss.interface.yaml
+++ b/xyz/openbmc_project/Sensor/Threshold/PerformanceLoss.interface.yaml
@@ -44,3 +44,36 @@
 
           PerformanceLossAlarmLow may be set to False to clear an alarm condition.
           The behavior of setting PerformanceLossAlarmLow to True is undefined.
+signals:
+    - name: PerformanceLossHighAlarmAsserted
+      description: >
+          The high threshold alarm asserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: PerformanceLossHighAlarmDeasserted
+      description: >
+          The high threshold alarm deasserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: PerformanceLossLowAlarmAsserted
+      description: >
+          The low threshold alarm asserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: PerformanceLossLowAlarmDeasserted
+      description: >
+          The low threshold alarm deasserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
diff --git a/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml b/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml
index 24a4d60..52b0f54 100644
--- a/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml
+++ b/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml
@@ -44,3 +44,37 @@
 
           SoftShutdownAlarmLow may be set to False to clear an alarm condition.
           The behavior of setting SoftShutdownAlarmLow to True is undefined.
+
+signals:
+    - name: SoftShutdownHighAlarmAsserted
+      description: >
+          The high threshold alarm asserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: SoftShutdownHighAlarmDeasserted
+      description: >
+          The high threshold alarm deasserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: SoftShutdownLowAlarmAsserted
+      description: >
+          The low threshold alarm asserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: SoftShutdownLowAlarmDeasserted
+      description: >
+          The low threshold alarm deasserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
diff --git a/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml b/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml
index e4d23ea..4182eca 100644
--- a/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml
+++ b/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml
@@ -43,3 +43,37 @@
 
           WarningAlarmLow may be set to False to clear an alarm condition.
           The behavior of setting WarningAlarmLow to True is undefined.
+
+signals:
+    - name: WarningHighAlarmAsserted
+      description: >
+          The high threshold alarm asserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: WarningHighAlarmDeasserted
+      description: >
+          The high threshold alarm deasserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: WarningLowAlarmAsserted
+      description: >
+          The low threshold alarm asserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.
+    - name: WarningLowAlarmDeasserted
+      description: >
+          The low threshold alarm deasserted.
+      properties:
+         - name: SensorValue
+           type: double
+           description: >
+               The sensor value that triggered the alarm change.