diff --git a/nomad/structs/events.go b/nomad/structs/events.go
new file mode 100644
index 000000000..769a79ee6
--- /dev/null
+++ b/nomad/structs/events.go
@@ -0,0 +1,18 @@
+package structs
+
+// Subsystem denotes the subsystem where a node event took place.
+type Subsystem string
+
+const (
+	Drain        Subsystem = "Drain"
+	Driver       Subsystem = "Driver"
+	Heartbeating Subsystem = "Heartbeating"
+)
+
+// NodeEvent is a single unit representing a node’s state change
+type NodeEvent struct {
+	Message string
+	Subsystem
+	Details   map[string]string
+	Timestamp int64
+}