fix health lastSeen format

internal/utils/strutils/format.go

@@ -45,6 +45,13 @@ func FormatDuration(d time.Duration) string {
 	return strings.Join(parts[:len(parts)-1], ", ") + " and " + parts[len(parts)-1]
 }
 
+func FormatLastSeen(t time.Time) string {
+	if t.IsZero() {
+		return "never"
+	}
+	return FormatTime(t)
+}
+
 func FormatTime(t time.Time) string {
 	return t.Format("2006-01-02 15:04:05")
 }

internal/watcher/health/monitor/json.go

@@ -28,10 +28,6 @@ func (jsonRepr *JSONRepresentation) MarshalJSON() ([]byte, error) {
 	if url == "http://:0" {
 		url = ""
 	}
-	lastSeen := "never"
-	if !jsonRepr.LastSeen.IsZero() {
-		lastSeen = strutils.FormatTime(jsonRepr.LastSeen)
-	}
 	return json.Marshal(map[string]any{
 		"name":        jsonRepr.Name,
 		"config":      jsonRepr.Config,
@@ -43,7 +39,7 @@ func (jsonRepr *JSONRepresentation) MarshalJSON() ([]byte, error) {
 		"latency":     jsonRepr.Latency.Seconds(),
 		"latencyStr":  strconv.Itoa(int(jsonRepr.Latency.Milliseconds())) + " ms",
 		"lastSeen":    jsonRepr.LastSeen.Unix(),
-		"lastSeenStr": lastSeen,
+		"lastSeenStr": strutils.FormatLastSeen(jsonRepr.LastSeen),
 		"detail":      jsonRepr.Detail,
 		"url":         url,
 		"extra":       jsonRepr.Extra,

internal/watcher/health/monitor/monitor.go

@@ -189,7 +189,7 @@ func (mon *monitor) checkUpdateHealth() error {
 	if result.Healthy != (mon.status.Swap(status) == health.StatusHealthy) {
 		extras := map[string]any{
 			"Service Name": mon.service,
-			"Last Seen":    strutils.FormatTime(mon.lastSeen),
+			"Last Seen":    strutils.FormatLastSeen(mon.lastSeen),
 		}
 		if !mon.url.Load().Nil() {
 			extras["Service URL"] = mon.url.Load().String()