diff --git a/lib/go/si/si.pb.go b/lib/go/si/si.pb.go
index 2ceace8..b86a534 100644
--- a/lib/go/si/si.pb.go
+++ b/lib/go/si/si.pb.go
@@ -235,6 +235,7 @@
 	EventRecord_APP                      EventRecord_Type = 2
 	EventRecord_NODE                     EventRecord_Type = 3
 	EventRecord_QUEUE                    EventRecord_Type = 4
+	EventRecord_USERGROUP                EventRecord_Type = 5
 )
 
 // Enum value maps for EventRecord_Type.
@@ -245,6 +246,7 @@
 		2: "APP",
 		3: "NODE",
 		4: "QUEUE",
+		5: "USERGROUP",
 	}
 	EventRecord_Type_value = map[string]int32{
 		"UNKNOWN_EVENTRECORD_TYPE": 0,
@@ -252,6 +254,7 @@
 		"APP":                      2,
 		"NODE":                     3,
 		"QUEUE":                    4,
+		"USERGROUP":                5,
 	}
 )
 
@@ -354,6 +357,8 @@
 	EventRecord_APP_FAILED        EventRecord_ChangeDetail = 210 // State change to failed
 	EventRecord_APP_RESUMING      EventRecord_ChangeDetail = 211 // State change to resuming
 	EventRecord_APP_EXPIRED       EventRecord_ChangeDetail = 212 // State change to expired
+	EventRecord_APP_CANNOTRUN     EventRecord_ChangeDetail = 213 // Application cannot run (maxApplications hit)
+	EventRecord_APP_CANRUN        EventRecord_ChangeDetail = 214 // Application is allowed to run (after maxApplications limit hit)
 	EventRecord_NODE_DECOMISSION  EventRecord_ChangeDetail = 300 // Node removal
 	EventRecord_NODE_READY        EventRecord_ChangeDetail = 301 // Node ready state change
 	EventRecord_NODE_SCHEDULABLE  EventRecord_ChangeDetail = 302 // Node schedulable state change (cordon)
@@ -373,6 +378,12 @@
 	EventRecord_ALLOC_TIMEOUT     EventRecord_ChangeDetail = 502 // Allocation cancelled due to timeout
 	EventRecord_ALLOC_REPLACED    EventRecord_ChangeDetail = 503 // Allocation replacement (placeholder)
 	EventRecord_ALLOC_NODEREMOVED EventRecord_ChangeDetail = 504 // Allocation cancelled, node removal
+	EventRecord_UG_USER_LIMITSET  EventRecord_ChangeDetail = 600 // Limit is configured for a given user
+	EventRecord_UG_GROUP_LIMITSET EventRecord_ChangeDetail = 601 // Limit is configured for a given group
+	EventRecord_UG_APP_LINK       EventRecord_ChangeDetail = 602 // Linkage is created between an application and a group
+	EventRecord_UG_APP_UNLINK     EventRecord_ChangeDetail = 603 // Unlinking an application and a group
+	EventRecord_UG_USER_RESOURCE  EventRecord_ChangeDetail = 604 // Resource usage updated for a user
+	EventRecord_UG_GROUP_RESOURCE EventRecord_ChangeDetail = 605 // Resource usage updated for a group
 )
 
 // Enum value maps for EventRecord_ChangeDetail.
@@ -395,6 +406,8 @@
 		210: "APP_FAILED",
 		211: "APP_RESUMING",
 		212: "APP_EXPIRED",
+		213: "APP_CANNOTRUN",
+		214: "APP_CANRUN",
 		300: "NODE_DECOMISSION",
 		301: "NODE_READY",
 		302: "NODE_SCHEDULABLE",
@@ -414,6 +427,12 @@
 		502: "ALLOC_TIMEOUT",
 		503: "ALLOC_REPLACED",
 		504: "ALLOC_NODEREMOVED",
+		600: "UG_USER_LIMITSET",
+		601: "UG_GROUP_LIMITSET",
+		602: "UG_APP_LINK",
+		603: "UG_APP_UNLINK",
+		604: "UG_USER_RESOURCE",
+		605: "UG_GROUP_RESOURCE",
 	}
 	EventRecord_ChangeDetail_value = map[string]int32{
 		"DETAILS_NONE":      0,
@@ -433,6 +452,8 @@
 		"APP_FAILED":        210,
 		"APP_RESUMING":      211,
 		"APP_EXPIRED":       212,
+		"APP_CANNOTRUN":     213,
+		"APP_CANRUN":        214,
 		"NODE_DECOMISSION":  300,
 		"NODE_READY":        301,
 		"NODE_SCHEDULABLE":  302,
@@ -452,6 +473,12 @@
 		"ALLOC_TIMEOUT":     502,
 		"ALLOC_REPLACED":    503,
 		"ALLOC_NODEREMOVED": 504,
+		"UG_USER_LIMITSET":  600,
+		"UG_GROUP_LIMITSET": 601,
+		"UG_APP_LINK":       602,
+		"UG_APP_UNLINK":     603,
+		"UG_USER_RESOURCE":  604,
+		"UG_GROUP_RESOURCE": 605,
 	}
 )
 
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+	0x33,
 }
 
 var (
diff --git a/scheduler-interface-spec.md b/scheduler-interface-spec.md
index bc78e25..904694a 100644
--- a/scheduler-interface-spec.md
+++ b/scheduler-interface-spec.md
@@ -874,6 +874,7 @@
       APP = 2;
       NODE = 3;
       QUEUE = 4;
+      USERGROUP = 5;
    }
 
    enum ChangeType {
@@ -903,6 +904,8 @@
      APP_FAILED         = 210;  // State change to failed
      APP_RESUMING       = 211;  // State change to resuming
      APP_EXPIRED        = 212;  // State change to expired
+     APP_CANNOTRUN      = 213;  // Application cannot run (maxApplications hit)
+     APP_CANRUN         = 214;  // Application is allowed to run (after maxApplications limit hit)
 
      NODE_DECOMISSION   = 300;  // Node removal
      NODE_READY         = 301;  // Node ready state change
@@ -925,6 +928,13 @@
      ALLOC_TIMEOUT      = 502;  // Allocation cancelled due to timeout
      ALLOC_REPLACED     = 503;  // Allocation replacement (placeholder)
      ALLOC_NODEREMOVED  = 504;  // Allocation cancelled, node removal
+
+     UG_USER_LIMITSET   = 600;  // Limit is configured for a given user
+     UG_GROUP_LIMITSET  = 601;  // Limit is configured for a given group
+     UG_APP_LINK        = 602;  // Linkage is created between an application and a group
+     UG_APP_UNLINK      = 603;  // Unlinking an application and a group
+     UG_USER_RESOURCE   = 604;  // Resource usage updated for a user
+     UG_GROUP_RESOURCE  = 605;  // Resource usage updated for a group
    }
 
    // the type of the object associated with the event
diff --git a/si.proto b/si.proto
index c19817a..596a86a 100644
--- a/si.proto
+++ b/si.proto
@@ -497,6 +497,7 @@
       APP = 2;
       NODE = 3;
       QUEUE = 4;
+      USERGROUP = 5;
    }
 
    enum ChangeType {
@@ -526,6 +527,8 @@
      APP_FAILED         = 210;  // State change to failed
      APP_RESUMING       = 211;  // State change to resuming
      APP_EXPIRED        = 212;  // State change to expired
+     APP_CANNOTRUN      = 213;  // Application cannot run (maxApplications hit)
+     APP_CANRUN         = 214;  // Application is allowed to run (after maxApplications limit hit)
 
      NODE_DECOMISSION   = 300;  // Node removal
      NODE_READY         = 301;  // Node ready state change
@@ -548,6 +551,13 @@
      ALLOC_TIMEOUT      = 502;  // Allocation cancelled due to timeout
      ALLOC_REPLACED     = 503;  // Allocation replacement (placeholder)
      ALLOC_NODEREMOVED  = 504;  // Allocation cancelled, node removal
+
+     UG_USER_LIMITSET   = 600;  // Limit is configured for a given user
+     UG_GROUP_LIMITSET  = 601;  // Limit is configured for a given group
+     UG_APP_LINK        = 602;  // Linkage is created between an application and a group
+     UG_APP_UNLINK      = 603;  // Unlinking an application and a group
+     UG_USER_RESOURCE   = 604;  // Resource usage updated for a user
+     UG_GROUP_RESOURCE  = 605;  // Resource usage updated for a group
    }
 
    // the type of the object associated with the event