Alerting: Add static label to all state history entries (#62817)

* Add static label to all state history entries

* Separate label and value visually

pkg/services/ngalert/state/historian/loki.go

@@ -22,6 +22,11 @@ const (
 	FolderUIDLabel = "folderUID"
 )
 
+const (
+	StateHistoryLabelKey   = "from"
+	StateHistoryLabelValue = "state-history"
+)
+
 type remoteLokiClient interface {
 	ping(context.Context) error
 	push(context.Context, []stream) error
@@ -72,6 +77,7 @@ func statesToStreams(rule history_model.RuleMeta, states []state.StateTransition
 		}
 
 		labels := mergeLabels(removePrivateLabels(state.State.Labels), externalLabels)
+		labels[StateHistoryLabelKey] = StateHistoryLabelValue
 		labels[OrgIDLabel] = fmt.Sprint(rule.OrgID)
 		labels[RuleUIDLabel] = fmt.Sprint(rule.UID)
 		labels[GroupLabel] = fmt.Sprint(rule.Group)

pkg/services/ngalert/state/historian/loki_test.go

@@ -59,11 +59,12 @@ func TestRemoteLokiBackend(t *testing.T) {
 
 			require.Len(t, res, 1)
 			exp := map[string]string{
-				"folderUID": rule.NamespaceUID,
+				StateHistoryLabelKey: StateHistoryLabelValue,
-				"group":     rule.Group,
+				"folderUID":          rule.NamespaceUID,
-				"orgID":     fmt.Sprint(rule.OrgID),
+				"group":              rule.Group,
-				"ruleUID":   rule.UID,
+				"orgID":              fmt.Sprint(rule.OrgID),
-				"a":         "b",
+				"ruleUID":            rule.UID,
+				"a":                  "b",
 			}
 			require.Equal(t, exp, res[0].Stream)
 		})