feat: Add a reference to the notification rule in the permalink

When notifications are being received but there's no record in the send
history, this will help us identify the notification rule that sent this
notificaiton.

Author: adityathebe

notification/cel.go

@@ -3,6 +3,7 @@ package notification
 import (
 	"errors"
 	"fmt"
+	"net/url"
 	"slices"
 	"time"
 
@@ -61,6 +62,28 @@ func (t *celVariables) SetSilenceURL(frontendURL string) {
 	}
 }
 
+func (t celVariables) WithNotificationRef(notificationID string) celVariables {
+	t.Permalink = appendRefNotification(t.Permalink, notificationID)
+	return t
+}
+
+func appendRefNotification(rawURL string, notificationID string) string {
+	if rawURL == "" || notificationID == "" {
+		return rawURL
+	}
+
+	u, err := url.Parse(rawURL)
+	if err != nil {
+		return rawURL
+	}
+
+	query := u.Query()
+	query.Set("refNotification", notificationID)
+	u.RawQuery = query.Encode()
+
+	return u.String()
+}
+
 type ResourceHealthRow struct {
 	Health    models.Health
 	Status    string

notification/events.go

@@ -169,7 +169,8 @@ func (t *notificationHandler) addNotificationEvent(ctx context.Context, event mo
 	}
 
 	for _, id := range notificationIDs {
-		if err := addNotificationEvent(ctx, id, celEnv, event, matchingSilences); err != nil {
+		notificationEnv := celEnv.WithNotificationRef(id)
+		if err := addNotificationEvent(ctx, id, &notificationEnv, event, matchingSilences); err != nil {
 			return ctx.Oops().Wrapf(err, "failed to add notification.send event for event=%s notification=%s", event.Name, id)
 		}
 	}
@@ -780,6 +781,8 @@ func _sendNotification(ctx *Context, payload NotificationEventPayload) error {
 	if err != nil {
 		return fmt.Errorf("failed to get cel env: %w", err)
 	}
+	notificationEnv := celEnv.WithNotificationRef(payload.NotificationID.String())
+	celEnv = &notificationEnv
 
 	if payload.GroupID != nil {
 		celEnv.GroupedResources, err = db.GetGroupedResources(ctx.Context, *payload.GroupID, payload.ResourceID.String())