feat: Monitor groups and chart information

server/internal/services/monitors.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"log"
+	"strings"
 	"time"
 
 	"gitea.hostxtra.co.uk/mrhid6/vantage/server/internal/checker"
@@ -21,6 +22,22 @@ func monCtx() (context.Context, context.CancelFunc) {
 	return context.WithTimeout(context.Background(), 5*time.Second)
 }
 
+// MaxMonitorGroupLen bounds the display-only group label. It is a heading on
+// the monitors page, not an identifier, so the cap is about the layout rather
+// than storage.
+const MaxMonitorGroupLen = 48
+
+// normaliseGroup collapses the ways two people write the same group. Grouping
+// is by exact string, so "  Production " and "Production" must not become two
+// headings.
+func normaliseGroup(g string) (string, error) {
+	g = strings.Join(strings.Fields(g), " ")
+	if len([]rune(g)) > MaxMonitorGroupLen {
+		return "", fmt.Errorf("group must be %d characters or fewer", MaxMonitorGroupLen)
+	}
+	return g, nil
+}
+
 func SpecFor(m *models.Monitor) checker.Spec {
 	return checker.Spec{
 		Type:           m.Type,
@@ -126,6 +143,11 @@ func CreateMonitor(instanceID string, m *models.Monitor) (*models.Monitor, error
 	if err := validateRunner(instanceID, m.Runner); err != nil {
 		return nil, err
 	}
+	group, err := normaliseGroup(m.Group)
+	if err != nil {
+		return nil, err
+	}
+	m.Group = group
 	m.InstanceID = instanceID
 	m.MonitorID = uuid.NewString()
 	m.CreatedAt = time.Now()
@@ -158,6 +180,17 @@ func UpdateMonitor(instanceID, monitorID string, upd bson.M) error {
 			return err
 		}
 	}
+	if raw, present := upd["group"]; present {
+		g, ok := raw.(string)
+		if !ok {
+			return fmt.Errorf("group must be a string")
+		}
+		group, err := normaliseGroup(g)
+		if err != nil {
+			return err
+		}
+		upd["group"] = group
+	}
 	if raw, present := upd["runner"]; present {
 		runner, ok := raw.(string)
 		if !ok {