should not notify when going from unknown to pending

pkg/services/alerting/notifiers/base.go

@@ -71,6 +71,11 @@ func (n *NotifierBase) ShouldNotify(ctx context.Context, context *alerting.EvalC
 		return false
 	}
 
+	// Do not notify when we become OK for the first time.
+	if context.PrevAlertState == models.AlertStateUnknown && context.Rule.State == models.AlertStatePending {
+		return false
+	}
+
 	// Do not notify when we become OK from pending
 	if context.PrevAlertState == models.AlertStatePending && context.Rule.State == models.AlertStateOK {
 		return false

pkg/services/alerting/notifiers/base_test.go

@@ -29,7 +29,6 @@ func TestShouldSendAlertNotification(t *testing.T) {
 			newState:     m.AlertStateOK,
 			prevState:    m.AlertStatePending,
 			sendReminder: false,
-			state:        &m.AlertNotificationState{},
 
 			expect: false,
 		},
@@ -38,7 +37,6 @@ func TestShouldSendAlertNotification(t *testing.T) {
 			newState:     m.AlertStateAlerting,
 			prevState:    m.AlertStateOK,
 			sendReminder: false,
-			state:        &m.AlertNotificationState{},
 
 			expect: true,
 		},
@@ -47,7 +45,6 @@ func TestShouldSendAlertNotification(t *testing.T) {
 			newState:     m.AlertStatePending,
 			prevState:    m.AlertStateOK,
 			sendReminder: false,
-			state:        &m.AlertNotificationState{},
 
 			expect: false,
 		},
@@ -56,7 +53,6 @@ func TestShouldSendAlertNotification(t *testing.T) {
 			newState:     m.AlertStateOK,
 			prevState:    m.AlertStateOK,
 			sendReminder: false,
-			state:        &m.AlertNotificationState{},
 
 			expect: false,
 		},
@@ -65,7 +61,6 @@ func TestShouldSendAlertNotification(t *testing.T) {
 			newState:     m.AlertStateOK,
 			prevState:    m.AlertStateOK,
 			sendReminder: true,
-			state:        &m.AlertNotificationState{},
 
 			expect: false,
 		},
@@ -74,7 +69,6 @@ func TestShouldSendAlertNotification(t *testing.T) {
 			newState:     m.AlertStateOK,
 			prevState:    m.AlertStateAlerting,
 			sendReminder: false,
-			state:        &m.AlertNotificationState{},
 
 			expect: true,
 		},
@@ -94,7 +88,6 @@ func TestShouldSendAlertNotification(t *testing.T) {
 			prevState:    m.AlertStateAlerting,
 			frequency:    time.Minute * 10,
 			sendReminder: true,
-			state:        &m.AlertNotificationState{},
 
 			expect: true,
 		},
@@ -138,7 +131,13 @@ func TestShouldSendAlertNotification(t *testing.T) {
 			name:      "unknown -> ok",
 			prevState: m.AlertStateUnknown,
 			newState:  m.AlertStateOK,
-			state:     &m.AlertNotificationState{},
+
+			expect: false,
+		},
+		{
+			name:      "unknown -> pending",
+			prevState: m.AlertStateUnknown,
+			newState:  m.AlertStatePending,
 
 			expect: false,
 		},
@@ -146,7 +145,6 @@ func TestShouldSendAlertNotification(t *testing.T) {
 			name:      "unknown -> alerting",
 			prevState: m.AlertStateUnknown,
 			newState:  m.AlertStateAlerting,
-			state:     &m.AlertNotificationState{},
 
 			expect: true,
 		},
@@ -157,6 +155,10 @@ func TestShouldSendAlertNotification(t *testing.T) {
 			State: tc.prevState,
 		})
 
+		if tc.state == nil {
+			tc.state = &m.AlertNotificationState{}
+		}
+
 		evalContext.Rule.State = tc.newState
 		nb := &NotifierBase{SendReminder: tc.sendReminder, Frequency: tc.frequency}