refactor(monit): drop retired v1 rule clients, add public v2 rule APIs

alert_rules_test.go

@@ -0,0 +1,54 @@
+package flashduty
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"testing"
+)
+
+func TestAlertRuleUpdateV2PreservesInvestigationTargetsPresence(t *testing.T) {
+	tests := []struct {
+		name    string
+		targets []InvestigationTarget
+		want    string
+	}{
+		{name: "omit keeps existing targets"},
+		{name: "empty clears targets", targets: []InvestigationTarget{}, want: `[]`},
+		{
+			name: "replace targets",
+			targets: []InvestigationTarget{{
+				Kind: "dashboard",
+				Dashboard: DashboardInvestigationTarget{
+					DashboardID: "01900000-0000-7000-8000-000000000001",
+				},
+			}},
+			want: `[{"dashboard":{"dashboard_id":"01900000-0000-7000-8000-000000000001"},"kind":"dashboard"}]`,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			client := newTestClient(t, func(w http.ResponseWriter, r *http.Request) {
+				if r.Method != http.MethodPost || r.URL.Path != "/monit/rule/v2/update" {
+					t.Errorf("unexpected request: %s %s", r.Method, r.URL.Path)
+				}
+				var body map[string]json.RawMessage
+				if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+					t.Errorf("decode request: %v", err)
+				}
+				if got := string(body["investigation_targets"]); got != tt.want {
+					t.Errorf("investigation_targets = %q, want %q", got, tt.want)
+				}
+				w.Header().Set("Content-Type", "application/json")
+				_ = json.NewEncoder(w).Encode(map[string]any{"data": body})
+			})
+			_, _, err := client.AlertRules.WriteUpdateV2(context.Background(), &AlertRuleV2{
+				ID:                   123,
+				InvestigationTargets: tt.targets,
+			})
+			if err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}

internal/cmd/gen/main.go

@@ -853,6 +853,11 @@ func (g *Gen) emitStruct(name string, s map[string]any) string {
 		case inReq && needsPointer && (isNullable(pv) || preserveAbsence):
 			jsonTag = k + ",omitempty"
 			toonTag = k + ",omitempty"
+		case inReq && !required[k] && preserveAbsence && strings.HasPrefix(gt, "[]"):
+			// Preserve nil (omitted) versus an explicit empty slice (clear).
+			// omitempty would drop both and silently keep the stored value.
+			jsonTag = k + ",omitzero"
+			toonTag = k + ",omitempty"
 		case inReq && !required[k]:
 			toonTag = k + ",omitempty"
 			if isStructField {